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

Bought this as part of my kit to test potential customer's water. This works very well showing the hardness in the water. It's easy to use and read results. You can push a button and it saves the reading, so it doesn't go away when you take it out of the water. Nice piece of equipment for water testing

Works well. If the reading is below 50, the water is good.

The media could not be loaded. 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!

This is a great quality product and easy to use.It fits in your pocket. It’s value for your money. The digital readout is lit up, bright and easy to read with a guide on the back of it.

Thank god for amazon as they allow return of items thatdo not work well. I have tried ten of these TDS pens and this one that looks like this has three manufacturers but they have this shape and they all have the adjustment screw, calibration screw on the back. I thought that meant you need to calibrate but these pens this being one of them are the only ones close to real and I got three of the same type, and they all ready less than 10 PPM apart which is fine for me. I can also calibrate them all the same which is fantastic as well

Super easy to use. And I love the storage case.My tap water was showing at 74 PPMThe filtered water from the water refill station at Walmart read at 7 PPMAnd just to test, distilled water was 0 :)

I can't comment on accuracy, but it seems to be working as intended for checking the TDS of a freshwater shrimp tank.

Very good product. Don't put away wet.