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

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!

I bought this to test my RO system. A quick AI search indicated HM Digital is a good, trusted brand. The initial reading suggested I replace my RO filter. When I took apart my system, I found the RO filter was in poor shape and did in fact need replacement. With the new filter in place, my water readings are now in the low teens. This meter helped identify and verify my RO filter status - without having to pay someone else to do it for me. I would highly recommend this tester. Especially over the cheaper and unreliable no-name brands.

Exactly as described. Functions flawlessly

Quick and easy to use. Comparable measured TDS level between my counter top RO unit and commercial bottled distilled water and significantly higher level in my tap water. Now I am using it to monitor my RO performance over time

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.

This TDS meter is incredibly easy to use and gives readings in seconds. We checked its accuracy by measuring PCR-grade water, which gave us a reading of 1 ppm. I use it regularly to check the performance of my reverse osmosis system and to see when it's time to replace the filters. It feels lightweight but does the job perfectly for the price. Highly recommend for peace of mind about your drinking water!

Works great to test my water

I found this meter easy to use and giving me valuable information

Very good and nice, and 👌 product 👌

Nice little solids tester for my drinking water maker on my sailboat

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