The PHEC-M01 is an accurate meter that monitors the water by the precise reading of PH/EC (or TDS)/Temperature. Features easy use via the LCD display and PH/EC sensor calibration, come with automatic temperature compensation (ATC). Key Features Accuracy Handy Technical Sheet Display: LCD Screen Power: DC24V/0.5A EC Range: 0.1~6 mS/cm pH Range : 0.1~14