TDS-3 Handheld TDS Meter With Carrying Case, 0 - 9990 ppm TDS Measurement Range, 1 ppm Resolution, +/- 2% Readout Accuracy

I bought the iSpring tester first because it's a known brand. However it was defective when opened the box. Ordered this one instead, it's working as a charm and build quality also exceeded the iSpring by a mile. I recommend this product to anyone who's looking for a water tester affordable and accurate.

Surprisingly helpful and easy to use! We just care about PPM (aka TDS) related to the Reverse Osmosis (RO) filter system we just installed, and this little guy does the trick. Inexpensive and working great for us for 2 weeks now!

This thing is so cool! It's so cheap compared to the alternatives and it is accurate upon arrival. I use it like a lab master and despite all the rough use it's still working.

Works great. Used for making maple syrup using an RO filter system.

I’ve been using this to monitor my RO system and aquarium water. It’s incredibly straightforward—just dip it in and you get a reading instantly. The build quality feels decent for the price, and the battery life has been impressive so far. My only minor issue is that it doesn't come with calibration fluid, so you have to trust the factory settings or buy extra supplies to be 100% sure of the accuracy. Overall, a must-have for the price.

What makes this tester stand out against many others: it has adjustable calibration and is calibrated at the factory. I have checked the readings against the reference solution and the calibration is accurate. The build quality is solid as well.

TDS translates to Total Dissolved Solids. I am happy with the TDS-3 tester. For drinking water and necessary minerals you should have a reading of 50-150. If lower you should add mineral drops to your glass. This tester does not read contaminates however which it never promised to do. Just wanted to add this for your information.

I’ve been using the HM Digital TDS-3 for my hydroponic system, and it’s been a game-changer. If you’re serious about growing healthy plants, keeping track of your nutrient levels is crucial, and this little device makes it incredibly easy. What I Like: ✅ Accurate & Reliable – The readings are consistent, and the 0–9990 ppm range covers all my needs. I can easily check if my nutrient solution is too strong or too weak. ✅ Temperature Compensation (ATC) – I don’t have to worry about temperature affecting the accuracy. The meter adjusts automatically. ✅ Super Easy to Use – Just dip it in, wait a couple of seconds, and get an instant reading. The hold function is great for locking the number so I can check after pulling my hand out of my reservoir. ✅ Compact & Battery-Saving – It’s small, comes with a protective case, and has an auto shut-off to save battery life. A Couple of Things to Keep in Mind: ❌ Not Waterproof – Be careful not to drop it in water. I make sure only the probes are submerged. ❌ Doesn’t Measure pH – This is strictly for TDS and temperature, so you’ll need a separate pH meter. Final Thoughts: For the price, this TDS meter is absolutely worth it. It gives me quick, accurate readings and helps me dial in the perfect nutrient levels for my plants. If you’re into hydroponics, aquaponics, or even just checking your water quality, I highly recommend it!