Pen Type Conductivity Meter EC (0_ 19.90 mS/cm / 0.10 mS/cm & ±1%Full Scale) measuring device Waterproof and dustproof floating IP-67 body Automatic heat compensation (ATC) Manual calibration option for more precise reading Automatic shutdown, Warning messages Hold function that instantly freezes the read value for easy recording Pen Type pH Meter 0.0 to 14.00 pH measuring range, 0.1 resolution, ±0.1 precision Automatic calibration & automatic liquid recognition, ATC Waterproof IP67 floating body Long sensor life without replacement Hold function button to freeze reading value for easy recording. Sensor protective cover that can be used as a reservoir for calibration fluid and sample