High .01 pH accuracy in a waterproof pocket-sized instrument. This unique unit displys pH and temperature readings on a single large display. It also features a double juntion electrode ideal for dirty water and solutions with heavy metals or other contaminants. It is waterproof, dustproof and it's housing protects it from rugged field or plant environments. Range -10.00 to 15.00 pH Resolution 0.01 pH Accuracy 0.01 pH Calibration Up to three points US or NIST(4.01, 6.86/7.00, 9.18/10.00) ATC Yes Electrode Replaceable double junction Temperature fe