Digital Aid Professional TDS, EC & Temperature Meter. 3 in 1. Professional Quality TDS Meter:0-9990ppm. Accurate and Reliable Water Test Meter. Ideal for Drinking Water, Aquariums. With Leather Case. Professional Quality, unlike Economy models available, You Get What You Pay For! If you are looking for a Super Accurate and Reliable Meter, this is the one for You! TDS tells you when you need to change your Filters... It Saves you Money and Protects Your Health! TECHNICAL SPECS: Accuracy:  2%. Range:0-5000ppm, 0-9990 s/cm, 0.1-80.0C, 32.0-176.0F. Last TDS Meter you'll have to buy, we're so confident we offer a 100% Money Back Guarantee for Life!