TDS Meter Digital Water Tester with Backlit LCD, Accurate Professional TDS EC Temperature Test Pen for Drinking Water Quality, Hydroponics, Swimming Pools, Aquariums, 0-9990 ppm, ± 2% Accuracy

Actually really accurate. I would say within 40 ppm difference with my expensive one. Worth it to own for the hydroponics oriented person

This is easy to use and read. Would buy again.

Absolute Lie! Battery cannot be removed!"✓IMPROVED DESIGN & REPLACEBLE BATTERY: The listed TDS pen is the 5th generation of TDS meter. The newly-design tds meter kit can be used to test ppm, electrical conductivity, Celsius and Fahrenheit temperature. The improved tds tester meter is a 4 in 1 device that helps the needed ones to get all the figures they want. With the removable battery you don’t have to buying a new one when it is out of battery, simply get CR2032 battery will make this tds meter tester back to life."

The digital tester did not work when I received it. Powers up but will not read anything other than temperature.

decent value & addition to any budding gardener. thumbs up !

Headline says it all

I like it.

Nice works ok