TDS-M2 TDS Meter Water Quality Tester 0-9990PPM

The TDS-M2 measures Total Dissolved Solids (TDS) in parts per million (ppm). TDS represents the total concentration of dissolved inorganic salts, minerals, and metals in water, primarily estimated by measuring the water's electrical conductivity. It is a key indicator of water purity, with lower ppm values generally indicating purer water.

To use it, remove the protective cap, press the power button to turn it on, and immerse the electrode tip into the water sample, ensuring the water level is above the minimum immersion line. Stir gently and wait for the reading to stabilize. Most handheld TDS meters like the TDS-M2 are factory-calibrated using a NaCl solution and typically do not require user calibration. For verification, you can use a calibration solution with a known ppm value.

Automatic Temperature Compensation (ATC) corrects the TDS reading to a standard reference temperature, usually 25°C (77°F). Water conductivity changes with temperature; a higher temperature increases conductivity, which would falsely indicate a higher TDS level without compensation. The built-in ATC sensor ensures readings are accurate and comparable regardless of the water sample's temperature.

The TDS-M2 is powered by two 1.5V LR44 button cell batteries, which are not included. Battery life depends on usage frequency but is typically extended by the auto power-off feature. A low battery indicator will appear on the LCD display when battery voltage drops, signaling that replacement is needed to maintain measurement accuracy.