AD12 is the most advanced microprocessor based Waterproof pH/Temp pocket tester in the market. Fast, stable and precise, these testers are for users that require the greatest accuracy. Simple user-replaceable pH/Temp probe: just unscrew the plastic ring on the top of the electrode and replace it with a new one! 2 rows display LCD (reads both pH and temperature measurements) and built-in HOLD function that freezes the display for easy and accurate recording. Other features such as stability indicator, automatic calibration and automatic temperature compensation make these waterproof pocket testers a must-have in a variety of industries. The modular design allows to replace the electrode in a fast and simple way.