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.

Has worked well for me. Easily usable and readable.

Well the reviews are true and was about 90 off the 342 solution when got it! I was able to find a small enough screwdriver to recalibrate. Although I got the hm com 100 meter from them so luckily already had and use 342 solution. So two meters and one calibration solution for both of makes sense! Although I do like my hm com 100 meter is a tad pricey.

Very accurate TDS Meter that includes organic detection. Much better than the $7-10 range TDS Meters.

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

Ugliest thing ive purchased since 1980s. This thing makes an antique Apple II look like an ipad. It works fine, but has not seen a design upgrade since its inception. Would have been more cost effective to just add the technology to some used casio calculators from 1984.

Works very well

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.

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