TDS Water Quality Testing Pen. Professional TDS, EC and Temperature Pen. Upgraded with big backlit LCD for easier reading, and auto-lock function for easier use Drinking Water Test Meter. To achieve high accuracy, equipped with premium quality titanium alloy probe, and reliable Automatic Temperature Compensation (ATC) ensures reading always be accurate at various temperatures High Accurate Testing Pen. TDS stands for Total Dissolved Solids, which are the inorganic salts and organic matter in a liquid. This includes calcium, magnesium, sodium, etc. TDS Meter Water Quality Tester. Features a hold function that saves measurements for convenient reading and recording LCD Display Water Tester. With the push of a button, the TDS can tell you your overall water purity level,which will be displayed on the screen in ppm TDS Meter Water Quality Tester. The TDS is great for checking your tap water quality, or knowing when to change a filter. TDS stands for Total Dissolved Solids, which are the inorganic salts and organic matter in a liquid. This includes calcium, magnesium, sodium, etc. TDS meter water quality tester Material: Aluminum. Precision: 2%-3% Range: 1 ~ 9990ppm Voltage: 3V Accuracy: 1ppm Color: White Size: 5.43x0.98inch. Products include: 1pc