PH Meter, 4-in-1 Digital PH ORP H2 Temp Meter with ATC, 0.01 Resolution High Accuracy PH Tester for Drinking Water Hydroponics Aquariums Swimming Pool Laboratory

Actually gave accurate results and the price was great.

This is pretty expensive to only work for 6 months. I do not recommend unless it is cheaper than the current $55 it is selling for. I changed the batteries and that is not the problem. I only used this for ORP and H2.

Worked great when you consider the price. Thankful I found this one!

It covers important issues relating to water quality. More instructions on usage would help.

This product works just fine, but it is horribly slow. You literally need to keep it in the water for five minutes to get your results. I'd recommend you try something different.

still testing

I bought this meter mainly for its ability to measure dissolved H2. I tested it using another meter dedicated strictly to H2 and a reagent type test. A 20% variations would be considered acceptable. I ran about 6 tests on water samples using a H2 generator run for 5 minutes, 10 minutes and 15 minutes. This meter gave me readings from 1.64 ppm to 1.76 ppm. The reagent tests 0.8 ppm to 1.2 ppm. A stand alone EHH-100 type of meter 0.94 ppm to 1.14 ppm. Ph measurements appear accurate. Temperature measurement appear accurate. So a great multi-purpose meter if you don't want H2.

After 3 months, used once a week, ORP value became inconsistent and now only reads in negative numbers. No way to calibrate ORP. Going into the trash.