EXTECH Waterproof pH Pens

Meets IP-67 waterproof rating. Auto buffer recognition. A single key for three-point calibration couldn't be easier. Use data hold to freeze the reading on display. Low-battery indicator with automatic shut off saves your battery. Auto shut off can also be disabled. No. 143496 has an automatic temperature compensation default at 25°C. No. 143497 has ATC and also <\n>displays pH and temperature readings simultaneously. Waterproof pH Pens come with a sensor cap, inner pH electrode protection cap and four LR44 button batteries. Electrode is NOT replaceable.