Unique temperature compensation function: Can automatically convert the TDS value at a water temperature of 25 ℃ TDS value: Represents the total content of water-soluble substances, for example: calcium, magnesium ions and some trace elements, etc. Large LCD display, waterproof design, easy to read TDS value (can not test the PH value or a specific value of a substance dissolved in the solution) More accurate and fast: Titanium alloy test probe, the reading is not affected by the magnetic field in the water, the reading is more accurate Energy-saving and durable: Long service life without frequent battery replacement, normal use for two years (1.5V*2 button battery)