Digital LCD water quality meter, professional measuring pen, water hardness, mineral impurity level in water Unique temperature compensation function: Can convert TDS value automatically at 25 water temperatureTDS 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 (PH or specific values of dissolved substances in solution can not be tested)More accurate and faster: Titanium alloy test probe, the reading is not affected by the magnetic field in the water, the reading is more accurateEnergy-saving and durable: Long service life without frequent battery replacement, normal use for two years (1.5V*2 button battery)Feature: Low power consumption and auto power off. Used in swimming pool, waterworks laboratory, disease control center, aquaculture, hospital Titanium alloy test probe, the reading will not be affected by the magnetic field in the Water affectedUnique temperature compensation function can automatically convert the TDS value to a water temperature of 25[Factors affecting TDS test]Water temperature: The TDS pen cannot be used to measure high temperature water (e.g. hot water)Water flow: TDS pens cannot be used to measure large bodies of water. Notes:1. Due to manual measurement, please allow 1-3 cm error. Make sure you don't mind before you bid.2.Colors may vary due to different monitors, please understand.