HM Digital 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.

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.

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.

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!

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

I tested this with my tap water and filtered water from the fridge. It comes calibrated from the factory, but not sure how long the calibration will last. The measurements were easy to read and matched the report from our water company when testing tap water, and it correctly reported that the hardness value was lower when testing filtered water, so it seems this device works well. I'm happy with it and glad I got it, especially for the low price.

After a month’s use monitoring drinking water, I've found it accurate and consistent. The unit delivered came with batteries and a carrying case included. Also included was a note from the suppliers asking me to get in touch if I noticed any errors - nice touch. Some reviewers have noted continuing varying read outs. I've noticed something similar when used with hot water but didn't find this a problem as it was mostly used with room temp water. In my opinion, it's accurate to within plus/minus 2%. This is based on ongoing readings given on municipal water, distilled water and stored samples. Granted, these aren't 'standard' samples but over time these samples confirmed the unit's accuracy and repeatability, in my opinion. I bought it to use as a quick check on my Brita water filter's performance and this it did admirably.

Usei um medidor e constatei que a água do filtro tem a mesma qualidade da água da torneira, com o mesmo número de resíduos. Tudo foi instalado conforme o manual. O produto me ajudou a ver que fui enganada

Purtroppo non ci sono istruzioni in italiano

C'était pareil fonctionne très bien il fait son boulot j'ai déjà changé les piles même avec une utilisation minimes. On verra bien avec les nouvelles piles

Al parecer mide muy bien el TDS (Total de sólidos disueltos) en el agua. Sin embargo me confundí a comprarlo ya que en realidad quería medir la dureza del agua (cuando busqué "dureza agua" en Amazon salieron infinidad de aparatos para medir el TDS). La dureza es otra cosa (cantidad de magnesio y calcio) mientras el TDS son todos los sólidos. Los suavizadores no afectan el TDS, solo la dureza, y compré el aparato para verificar el funcionamiento de mi suavizador.