Adwa Pocket pH Meter AD12 Waterproof pH-Temperature tester, made in Romania. AD12 is the most advanced microprocessor-based Waterproof pH/Temp pocket tester on the market. Fast, stable, and precise, these testers are for users who 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 indicators, automatic calibration, and automatic temperature compensation m,ake these waterproof pocket testers a must-have in a variety of industries. The modular design allows replacing the electrode in a fast and simple way. User Manual of Pocket pH Meter AD12