AZ Water Quality Testing pH Pen features:
* Big LCD dual display Temperature & pH value with ATC
* pH range: 0.00~14.00
* pH value resolution up to 0.01
* Measuring stability indicator
* One touch auto-calibration up to 3 points
* Calibration values are adjustable
* Cap to keep sensor wet & last life time
* Power by 4pcs LR44 batteries
* Waterproof housing meets IP65 rating
* Data hold to freeze readings
* Pen size, easy to fit in pocket
* Low battery indicator
* Auto power off
* Temperature ℃/°F unit switchable