Waterproof Conductivity Meter (Pen Style) Meters & Solutions How often should I calibrate

How often should I calibrate it

users manual

Total Height: 10 in

2 and 12 ft - 21

and Grower-Friendly:

Waterproof Conductivity Meter (Pen Style) Meters & Solutions How often should I calibrateHighly stable and accurate readings with a large LCD display. Designed for simple one hand operation. Simultaneously displays the parameter being measured and temperature in C or F. Features automatic temperature compensation, 2 pt. calibration, auto power off, hold function, and a low battery indicator. The case is IP65 waterproof, and will float if accidentally dropped into the water. Comes with 4 button cell batteries and a built in probe with