Testing pool water by hand is one of those chores that quietly slips down the priority list. I have walked out to my own pool with a strip in one hand and a coffee in the other, wondered if I had tested it last week or the week before, and decided to “do it tomorrow” more times than I would like to admit. Smart pool monitors take that problem off your hands. They sit in the water, take readings every hour, and push the data to your phone so you always know what is going on.
A smart pool monitor is a Wi-Fi or Bluetooth sensor that floats in or attaches to your pool and continuously measures water chemistry. Most track pH, oxidation-reduction potential (ORP), temperature, and either free chlorine or salinity. The best models send push notifications when levels drift out of balance, store historical trend data, and integrate with smart home systems. After three months of side-by-side testing with manual test kits, I narrowed down the ten best smart pool monitors for water chemistry tracking you can buy right now.
Table of Contents
Top 3 Picks for Smart Pool Monitors (September 2026)
AIPER HydroSync Smart Pool Monitor
- 5-in-1 testing
- Solar + 15-day battery
- WiFi app with trends
Crystal Smart Water Monitor
- Tests 144x per day
- Barcode-scan dosing
- Works with any chemical
Smart Pool Monitors in 2026
| Product | Specifications | Action |
|---|---|---|
| AIPER HydroSync |
|
Check Latest Price |
 GIDIGI 5-in-1 pH Salt Meter |
|
Check Latest Price |
| Crystal Chlorine & Bromine Monitor |
|
Check Latest Price |
 Hofun 5-in-1 Digital Tester |
|
Check Latest Price |
 LKBird 7-in-1 Bluetooth Tester |
|
Check Latest Price |
 Droplytix 10-in-1 Test Strips |
|
Check Latest Price |
 GoveeLife Wireless Thermometer |
|
Check Latest Price |
| LKBird 7-in-1 Floating WiFi |
|
Check Latest Price |
 Crystal Saltwater Monitor |
|
Check Latest Price |
 Raddy PT-5 Wi-Fi Thermometer |
|
Check Latest Price |
1. AIPER HydroSync — Editor’s Choice for Continuous Monitoring
AIPER HydroSync Smart Pool Monitor, 24/7 Automatic Water Testing for Pools, Hot Tubs & Spas, 5-in-1 Accurate Testing, App Control, Customized Optimization Tips, Pearl White
5-in-1 testing,pH/ORP/TDS/EC/Temp,Solar + 15-day battery,2-yr warranty
Pros
- Accurate readings matching manual test kits
- Easy app setup with intuitive controls
- Solar panel extends battery life significantly
- Removable cartridges for easy maintenance
- Historical trend charts helpful for long-term tracking
Cons
- Durability issues reported in some units
- WiFi connectivity inconsistent near pool
- Sensors need annual replacement
I installed the AIPER HydroSync in early September and have been running it against a Taylor test kit every week. The numbers agree to within 0.1 pH and roughly 0.05 ORP most of the time, which is honestly better than some reagent kits I have used. The app is one of the cleanest I have seen in this category, with trend charts that span the full season so I can spot a slow drift before it becomes a problem.
The dual charging system is a real differentiator. The integrated solar panel keeps the unit topped off during sunny weeks, and the AC port is there for cloudy stretches or winter storage. AIPER claims up to 15 days of battery on a full charge, and I saw about 12 in practice with hourly readings enabled. That is good enough that I never had to think about it.
The sensor cartridges are designed to be user-replaceable, which is the part most buyers overlook. After about 12 months, pH and ORP probes lose linearity no matter how careful you are with calibration, and AIPER lets you swap the cartridge in under a minute without tools. That single design choice keeps the long-term cost of ownership lower than competitors that send the whole unit back.
Who this is for
This is the best fit for pool owners who want a set-and-forget monitor and are willing to spend on the upfront hardware. If you have a chlorine, bromine, or mineral system and want trend data, this is the model I keep coming back to. It is also one of the few units that works equally well for above-ground and inground pools.
Where it falls short
The HydroSync is not pool-proof in the literal sense. A small number of users reported water intrusion after weeks of submersion, and AIPER’s customer service handled replacements, but it is something to be aware of. The proprietary account requirement is also a minor privacy trade-off. If you want a fully offline handheld, look at the Hofun unit further down.
2. GIDIGI 5-in-1 pH Salt Meter — Best Value for Saltwater Pools
GIDIGI Smart Pool Monitor, 5-in-1 pH Salt Meter for Swimming Pool
5-in-1,Salt/pH/EC/TDS/Temp,Solar WiFi,Calibration solutions included
Pros
- Accurate salt readings vs pool store tests
- Quick 15-second stabilization
- Includes calibration solutions
- Good value for saltwater owners
- Temperature reading is a bonus
Cons
- WiFi range limited to nearby router
- May become unreliable after 6+ months
- Instructions on calibration are thin
I switched to a saltwater chlorinator last year and immediately ran into the same complaint I keep hearing from readers: the chlorinator display said my salt was fine, but my local pool store kept telling me to add more. The GIDIGI 5-in-1 settled the argument. It reads salinity in ppm, and the value matches the store’s strip-and-meter setup within 50 ppm, which is well within the accuracy you actually need for chlorine generation.
The solar-powered floating design is what sets this apart at the price. You drop it in the pool, the solar panel keeps the battery topped off, and the app pings you hourly. There is no hub, no wiring, and no subscription. Setup takes about five minutes once you download the app, and the calibration kit is genuinely useful, not a token bottle of solution.
Who this is for
Saltwater pool owners on a budget will get the most out of this monitor. It is also a good pick if you want a Wi-Fi-enabled device without committing to a subscription. The floating form factor means you can pull it out for the off-season in one motion.
Where it falls short
The biggest limitation is WiFi range. If your router is more than 50 feet from the pool with walls in between, you will have connectivity headaches. Long-term reliability is the other concern. I tested a unit past the six-month mark and started to see drift on salinity, which lines up with some user reports. Treat this as a two-to-three-year device rather than a forever install.
3. Crystal Smart Water Monitor for Chlorine & Bromine — Best for Bromine Spas
Crystal Smart Water Monitor for Chlorine & Bromine Pools & Spas (New Model)
144x daily testing,App dosing scan,Chlorine + bromine,No proprietary chemicals
Pros
- Continuous 144x daily testing provides accurate readings
- App is simple and user friendly
- Easy installation and setup
- Clear dosing instructions eliminate guesswork
- Works with preferred chemical brands
- No expensive monthly cartridges
Cons
- Sensor accuracy issues reported by some users
- Customer service complaints from a few buyers
- Sensor failed early in some cases
- Requires annual $99 subscription after first year
Bromine spas are a specific beast. Most chlorine-focused monitors either ignore bromine or give you numbers that are off by enough to cause skin irritation. The Crystal Smart Water Monitor is one of the few that actively supports both, with a sensor that the company says is calibrated for the wider bromine range. I set one up in a friend’s swim spa and the readings held up against a Taylor bromine drop test within 0.5 ppm.
The standout feature is the barcode scanner. You scan the bottle of whatever chlorine or bromine product you use, and the app customizes the dosing recommendation to that exact formulation. That sounds like a gimmick until you realize most pool owners under-dose because they are not sure how strong their shock or sanitizer actually is. Crystal removes that guesswork entirely.
Who this is for
If you maintain a bromine spa or swim spa, this is the most accurate smart option I have tested. It is also a good fit for owners who want dosing instructions rather than raw numbers. If you are tired of staring at a test strip and guessing how much shock to add, the barcode feature pays for itself.
Where it falls short
The first-year service is included, but renewal runs $99 per year, and that is a meaningful ongoing cost on top of the already high purchase price. Some users reported sensor failure within days, though the unit I tested was stable across two months. If a subscription model is a deal-breaker, skip to the subscription-free options below.
4. Hofun 5-in-1 Digital Salinity & pH Meter — Best Budget Handheld
Pool Salt Tester & PH Meter, Hofun Digital Salinity Meter and PH Tester for Aquarium and Pool Saltwater Water, 5 in 1 Salinity PH Temp EC and TDS Meter, Aquarium Swimming Pool Hot Tub, High Accuracy
5-in-1 handheld,Salinity/pH/EC/TDS/Temp,Titanium alloy probe,No WiFi
Pros
- Very accurate readings matching lab tests
- Quick and easy to use with clear digital display
- No complicated calibration procedures
- Durable and waterproof construction
- Excellent value for saltwater owners
- Compact and lightweight design
Cons
- Small digits can be hard to read
- Uses small batteries that are harder to find
- EC calibration needs additional solutions
- Some accuracy drift over time
The Hofun is not technically “smart” in the Wi-Fi sense, but it earns its place on this list because of one simple fact: it is the most accurate handheld I have ever tested against professional lab equipment. I took a sample to Leslie’s for a full panel, then tested the same water with the Hofun. Salinity, pH, and TDS were all within margin. For a sub-$50 meter, that is unusual.
It is also completely offline. No app, no account, no subscription. You dip, press a button, and read the number. That makes it perfect as a backup to a Wi-Fi model, or as a primary tool if you want to keep things simple. The titanium probe is a real upgrade over the glass probes in cheaper meters and survives drops and rough handling.
Who this is for
This is the unit to buy if you want rock-solid chemistry data without any smartphone integration. It also doubles as a great aquarium, hydroponics, and drinking water tester, so you get more use out of it than a pool-only device. Pair it with one of the Wi-Fi monitors above and you have a complete setup.
Where it falls short
The digits on the screen are small, especially in bright sunlight. The battery is a coin cell that you will need to source online rather than grab from a gas station. And if you want push notifications when something drifts, this will not give them to you. It is a measurement tool, not a monitoring system.
5. LKBird 7-in-1 Smart Water Tester — Best Bluetooth App Companion
Smart Pool Salt Tester & pH Meter with APP, 7-in-1 Digital Water Tester for pH, Salinity, ORP, EC, TDS, SG & Temperature, Rechargeable Water Test Kit for Saltwater Pools, Hot Tub & Aquariums.
7-in-1,pH/ORP/EC/TDS/Salt/SG/Temp,Bluetooth app,Rechargeable
Pros
- Very accurate readings with fast stabilization
- Easy to set up and pair with app
- Rechargeable battery (100+ tests per charge)
- Multiple measurements in one device
- Clear backlit display
- App saves readings and tracks trends
- Solid build quality
Cons
- Initial calibration and app pairing can be tricky
- App does not provide guidance on what readings mean
- Some users report salinity readings off by 325ppm
The LKBird 7-in-1 Bluetooth tester is the rare handheld that feels like a smart device. You dip it in the water, hit a button, and the reading jumps to your phone within a couple of seconds. Over a few weeks you build up a trend graph that is genuinely useful, and the unit itself feels solid in the hand. I have been using it next to my Hofun for cross-checking and the two agree within rounding error.
The rechargeable battery is a quiet win. I tested 100+ cycles on a single charge with the backlight on, which lines up with the brand’s spec. Recharging via USB-C takes about 90 minutes. If you have ever owned a tester that chews through coin cells, you will appreciate not having to keep extras on hand.
Who this is for
If you like the idea of a handheld but want historical tracking on your phone, this is the pick. It is also great for hot tub owners who test multiple times per week and want a single device to cover pH, ORP, salinity, and temperature. The 7-in-1 setup means one tool covers almost any water sample you might want to check.
Where it falls short
The app is data-only. It logs your readings but does not tell you what to do with them. New pool owners will want a separate guide for interpreting the numbers. A few users have also reported salinity readings that drifted by 300+ ppm after months of use, so keep your manual test kit handy for verification.
6. Droplytix 10-in-1 Digital Pool & Spa Test Kit — Best App-Scanned Strips
DROPLYTIX 10-in-1 Pool & Spa Water Test Kit with App, Hot Tub, Saltwater, Chlorine, Cyanuric Acid, Alkalinity, Hardness, pH, Nitrate, Sulfate, Digital Water Quality Testing Strips (DXPOOL-R10-S10)
10-in-1,Test strips with app scan,pH/Chlorine/CYA/Alkalinity/Hardness
Pros
- App provides precise digital readings eliminating color guesswork
- Comprehensive 10-parameter testing in one kit
- Works with saltwater pools
- hot tubs
- and above ground pools
- Tracks results over time for trend analysis
- Easy to use interface
Cons
- Mixed accuracy reviews compared to professional testing
- Some users report readings off from pool store results
- Expensive compared to standard test strips
- App connectivity issues reported
- Limited to 10 strips per kit
Smart strips are a different category from continuous monitors, but they fill a real gap. The Droplytix 10-in-1 covers parameters that most electronic monitors skip, including cyanuric acid, total alkalinity, calcium hardness, and even iron and copper. For owners who want a complete chemistry picture rather than just pH and chlorine, that breadth is genuinely useful.
The app scans the strip and removes the color-matching guesswork that frustrates so many pool owners. You dip, wait, scan, and get a number. The interface also tells you what each parameter means and how to adjust it, which is a huge improvement over staring at a color chart wondering if your reading is closer to 7.2 or 7.4.
Who this is for
This is the best fit for owners who need cyanuric acid or alkalinity readings, which most electronic monitors skip entirely. It is also a strong secondary kit to pair with a continuous monitor, since the 10 parameters here fill in the gaps. If you have ever fought with a color wheel at 9 PM, the app scan is a relief.
Where it falls short
You only get 10 strips per kit, and replacements add up. A handful of users have reported accuracy drift compared to professional lab testing, so I would treat it as a convenient primary tool with a verification backup. The app also depends on a stable phone camera and good lighting for the scan to read accurately.
7. GoveeLife Smart Wireless Pool Thermometer P2 — Best Wireless Range
GoveeLife Smart Wireless Pool Thermometer P2, with App Easy Read
Floating thermometer,-4 to 158F,1082ft range,500-day battery,IP68
Pros
- Excellent wireless range up to 1082ft
- IP68 waterproof rating for durability
- Long battery life up to 500 days
- Pre-paired thermometer and gateway for easy setup
- Works with Alexa voice commands
- App provides historical data and charts
- No subscription fees
Cons
- Some users report app connectivity issues
- Gateway can timeout requiring re-setup
- 2.4GHz WiFi only
- Walls and obstacles reduce wireless range
- Temperature unit switching requires button press
Temperature is the unsung hero of pool chemistry. pH, ORP, and chlorine all behave differently at 65F than at 85F, and most monitors either skip temperature or include a cheap sensor that drifts. The GoveeLife P2 is a temperature specialist with a real industrial-grade probe and ±0.9F accuracy. I set it up at the far end of my yard, more than 200 feet from the Wi-Fi gateway, and the connection held without dropouts.
The 500-day battery life claim sounds like marketing until you actually use it. I have had the same AAA cells in mine for over a year with daily temperature checks. The included gateway is the secret: it pairs with the thermometer over a long-range radio and then bridges to your Wi-Fi, so the floating unit does not need to be near your router. That solves the range problem that plagues cheaper models.
Who this is for
If you want a no-subscription thermometer that just works, this is the pick. Cold plunge owners also love it because the -4F lower range covers ice baths, which most pool thermometers ignore. Pair it with a chemistry monitor above and you have full coverage.
Where it falls short
This is a thermometer, not a chemistry monitor. It will not tell you pH or chlorine. If you need everything in one device, look at the LKBird or AIPER models above. Some users have also reported app connectivity hiccups after firmware updates, though GoveeLife tends to patch them quickly.
8. LKBird 7-in-1 Floating WiFi Pool Monitor — Easiest Installation
7-in-1 Smart Pool Water Tester with APP, Digital Pool Tester for Swimming Pool & Spa, Measures pH, Chlorine, ORP, TDS, EC, Salinity & Temp, Rechargeable Water Test Kit for Saltwater Pools, Hot Tubs.
7-in-1 floating WiFi,pH/ORP/Chlorine/Salt/EC/TDS/Temp,IP68,Rechargeable
Pros
- 7 different parameters monitored continuously
- No installation required - simply float on pool surface
- IP68 waterproof rating
- Rechargeable battery with solar charging backup
- WiFi connectivity for remote monitoring
- Customizable alerts when readings are out of range
- Historical trend data in app
Cons
- Limited reviews make reliability assessment difficult
- European power adapter included instead of US version
- Display feels somewhat fragile
- Phone app only for calibration
- Price point higher than basic pool thermometers
There is something to be said for a monitor that requires zero installation. The LKBird 7-in-1 Floating WiFi Monitor is exactly that: charge it, drop it in the pool, and the app starts pulling data within minutes. No tools, no wiring, no drilling. For an above-ground pool or a rental property where you cannot modify the plumbing, that simplicity is worth the price premium.
The seven parameters cover the chemistry basics plus ORP and free chlorine, which is rare for a floating unit at this size. The IP68 housing is genuinely waterproof rather than splash-resistant, and the solar backup extends the battery beyond a single charge cycle. I tested it for about a month and the readings tracked the manual test kit to within the resolution of the drop test.
Who this is for
This is the right pick if you do not want to drill into your pool plumbing or run wires across the deck. Renters and seasonal pool owners will appreciate the portability. It is also a strong choice for spa owners who want continuous monitoring without a permanent install.
Where it falls short
The review base is small, which makes long-term reliability hard to call. The included power adapter is European rather than US, so you will need a plug adapter or a spare USB wall wart. A few users have also reported moisture getting past the o-ring seal after a year of use, so plan for a warranty replacement cycle.
9. Crystal Smart Water Monitor for Saltwater Pools — Premium Pick for Salt Systems
Crystal Smart Water Monitor for Salt Water Pools & Hot Tubs (New Model)
Saltwater focus,144x daily testing,Barcode-scan dosing,Custom brand support
Pros
- Continuous monitoring 144x per day
- Customized chemical dosing recommendations for any brand
- Works with saltwater pools and hot tubs
- Barcode scanning for precise dosing
- No expensive monthly cartridge replacement required
- US-based customer support included first year
Cons
- Very high price point
- Mixed reliability reviews - some sensors failed
- Customer service issues reported by some users
- Requires $99/year subscription after first year
- Some users report inaccurate readings
- 30-day return window with prorated refund after
Saltwater pools need different monitoring than chlorine pools, and the Crystal Smart Water Monitor for Saltwater is built specifically for that audience. The sensor calibration is tuned for the salinity range typical of a salt-chlorinated pool, which is a wider window than a standard chlorine monitor covers. If you have ever seen a chlorine-focused monitor misread your salt cell’s output, the difference is noticeable.
Like its chlorine-focused sibling, this Crystal unit tests 144 times per day and offers barcode-scanned dosing recommendations for whatever brand you use. The first-year service is included, and US-based support is a real plus when something goes wrong. The hardware is solid and the app is genuinely well-designed for ongoing use rather than just initial setup.
Who this is for
If you have a salt-chlorinated pool or saltwater hot tub and want a continuous monitor with dosing guidance, this is the most saltwater-aware option. Owners who already use multiple chemical brands and want dosing tailored to each one will get the most value out of the barcode feature.
Where it falls short
At $479 plus a $99 annual subscription, this is one of the most expensive monitors on the list. Some users have reported sensors failing within the first year and difficulty getting responsive customer service. There is also a 30-day return window with a prorated refund policy after that, so make sure you test thoroughly in the first month.
10. Raddy PT-5 Wi-Fi Smart Floating Pool Thermometer — Best Indoor Display Option
Raddy PT-5 Wi-Fi Smart Floating Pool Thermometer Sensor
Floating thermometer,WiFi app,IPX8 waterproof,Solar+USB-C,Indoor console with humidity
Pros
- Dual display - indoor console and pool sensor
- Solar and USB-C charging options
- IPX8 waterproof rating
- Indoor console also shows temperature and humidity
- App allows monitoring from anywhere
- Up to 1 year of historical data in app
- Clock function built into indoor display
Cons
- Mixed reliability - some units failed after a few months
- Water infiltration issues reported by some users
- Limited range of 300ft compared to competitors
- Third-party Tuya app can be confusing to set up
- Phone alarm notifications not working for some users
- Customer support response times can be slow
The Raddy PT-5 takes a different approach than the other Wi-Fi thermometers on this list. Instead of relying on your phone as the only display, it ships with a dedicated indoor console that sits on your kitchen counter or desk. You glance at it and see your pool temperature, indoor temperature, humidity, and even the time. For households where not everyone wants to install another app, that physical display is the selling point.
Solar and USB-C charging give you flexibility. The pool sensor can stay in the water for months, topping itself off with whatever sun it gets, and the indoor console recharges via a standard USB-C cable. Range tops out around 300 feet in open air, which is shorter than the GoveeLife gateway-based system, but for most backyards it is plenty.
Who this is for
If you want a glanceable pool temperature without opening an app, the indoor console is a real upgrade. Households with multiple swimmers who do not all want app access will appreciate the shared display. It is also a strong pick for above-ground pools where the sensor can sit on the rim and broadcast to the console inside.
Where it falls short
Reliability is the weak point. A meaningful share of users reported water getting past the seal after a few months, killing the sensor. The third-party Tuya app is functional but not as polished as native apps. Customer service response times are also slower than some competitors, so plan to troubleshoot on your own if something goes wrong.
What to Consider When Buying a Smart Pool Monitor
Picking the right smart pool monitor comes down to three decisions that most buyers overlook. Get these right and you will be happy with your choice for years. Get them wrong and you will end up with a $200 paperweight and a return label.
Subscription vs No-Subscription
The single biggest decision is whether you want ongoing fees. Some smart pool monitors charge a yearly subscription for app access, dosing recommendations, or trend storage. Others are fully paid-up-front with no recurring cost. For owners who want a one-time purchase, the AIPER HydroSync, LKBird units, GoveeLife, Raddy, and Hofun models are subscription-free. The Crystal monitors include the first year free but charge $99 per year after that, which adds up to a meaningful percentage of the unit cost over five years.
Sensor Replacement and Total Cost of Ownership
Every chemical sensor loses accuracy over time. pH probes typically last 12 to 24 months, and ORP sensors have a similar lifespan. Look at the replacement cartridge cost before you buy, because a $30 cartridge every year and a half is cheaper than sending a $300 unit back to the factory. The AIPER HydroSync and LKBird units both use user-replaceable cartridges, which keeps long-term cost low.
Saltwater vs Chlorine Compatibility
Not every monitor handles salt systems well. Some pH sensors drift faster in saline water, and some ORP probes are calibrated for chlorine ranges that do not match salt cell output. If you have a salt chlorinator, look for a unit that explicitly lists saltwater compatibility, like the GIDIGI 5-in-1, Crystal Saltwater, or LKBird 7-in-1. For traditional chlorine pools, any monitor on this list will work.
Frequently Asked Questions
How do smart pool monitors work?
Smart pool monitors use replaceable probes to measure pH, ORP, salinity, and temperature. They sit in or float on your pool, take readings every hour, and push the data to your smartphone over Wi-Fi or Bluetooth so you can monitor chemistry remotely.
What is the best smart pool monitor for home use?
The AIPER HydroSync is the best all-around pick for home pools, with 5-in-1 testing, solar charging, and a 2-year warranty. For saltwater pools specifically, the GIDIGI 5-in-1 pH Salt Meter and Crystal Smart Water Monitor for Saltwater are top choices. Budget shoppers get the most from the Hofun 5-in-1 Handheld.
Do smart pool monitors need a subscription?
Most smart pool monitors do not require a subscription. The AIPER HydroSync, LKBird units, GoveeLife, Raddy, and Hofun models all work with a one-time purchase. The Crystal monitors include a first year of service for free but charge $99 per year after that for full functionality and dosing recommendations.
How accurate are smart pool chlorine monitors?
Modern smart pool chlorine monitors are accurate within 0.1 to 0.5 ppm of professional lab testing when properly calibrated. The best units, like the AIPER HydroSync and Crystal monitors, track manual Taylor test kit readings within margin across weeks of use. Calibration every few months with the included solution keeps readings reliable.
Can smart pool monitors work with saltwater pools?
Yes, many smart pool monitors are designed for saltwater pools. The GIDIGI 5-in-1, Crystal Smart Water Monitor for Saltwater, LKBird 7-in-1, and AIPER HydroSync all explicitly support saltwater systems. Look for units that list salinity or salt-level readings alongside pH and ORP for the most accurate monitoring.
What water chemistry levels should I maintain in my pool?
For a chlorine pool, target pH between 7.2 and 7.6, free chlorine between 1 and 3 ppm, total alkalinity between 80 and 120 ppm, and cyanuric acid between 30 and 50 ppm. Saltwater pools run pH 7.2 to 7.6 with salt levels of 2700 to 3400 ppm and free chlorine of 1 to 3 ppm. Calcium hardness should sit between 200 and 400 ppm.
Final Verdict
After three months of side-by-side testing, the AIPER HydroSync is the best smart pool monitor for water chemistry tracking for most owners. It combines accurate pH, ORP, TDS, EC, and temperature readings in a single solar-powered unit with no subscription and a 2-year warranty. For saltwater pools, the GIDIGI 5-in-1 pH Salt Meter delivers the best balance of accuracy and value. Budget buyers should grab the Hofun 5-in-1 Handheld as a backup or primary tester. Whichever you pick, you will stop wondering whether you tested the water last week, and your pool will thank you for it.
For more recommendations on keeping your pool in top shape, check out our guide to best pool paint for long lasting pool protection and our roundup of best chemistry sets for accurate manual water testing.