AZ Waterproof EC Pen’s raise the bar in ease of use, reliability, function and price because they provide a large IP65 LCD screen with dual EC and temperature display. They have a wide measuring range from 0-9999ppm and a temperature range of -5 degrees to +60 degree Celsius. Another great feature is the waterproof IP65 keypad with simple calibration and also includes a hold button to freeze current readings in low visibility. ATC (auto temperature compensation) ensure accurate readings in all climates. Auto off function maximises battery life.