Low power consumption and automatically shut down. Used in Swimming Pool, Aqueduct Laboratory, Disease Control Center, Aquaculture, Hospital Titanium alloy test probe, the measurement value is not affected by the magnetic field in the water Unique Temperature Compensation Function can automatically convert TDS value to 25 water temperature Press the on / off button, then put the electrode in the measured solution (Please do not exceed the immersion line - See photo) Wait until the value is stable (2-6sds), press the hold button and read the TDS figure displayed on the LCD screen When the same measurement is finished, press the on / off button to close TDS tester, wipe off the electrode, then cover the electrode protection sleeve.