The TDS meter is a precision instrument designed for a basic water test to determine the total amount of dissolved substances (TDS - Total Dissolved Solids) in water (minerals, salts, metals, etc.). The resulting value is given as PPM (parts per million). The device is equipped with automatic temperature compensation - the results should not be affected by the water temperature. The device can be used to determine the difference between tap water, well water or filtered water, etc. Other uses swimming pools and spas, ponds and aquariums, agriculture and hydroponics, wastewater, cooling towers, food industry, laboratories, educational purposes and the like. The instrument is also suitable for measuring the efficiency of reverse osmosis in the purification of water from solutes. Technical parameters: Measuring range: 0–9990 ppm, 0–9990 us/cm, can be switched Measurement temperature: 0–50 ° C Temperature measuring range: 0.1–80.0 ° C Accuracy: ± 2% Power supply: 1 × 3 V (CR2032 lithium battery). The battery is included in the package Dimensions: 154 × 30 × 13 mm Auto power off: 5 minutes