Emaux 9318522 Digital pH and Temperature Meter - This pocket Digital pH and Temperature Meter is designed for on-the-go measurements of pH and temperature. The high accuracy pen type meter uses combined pH electrode of high sensitivity, fast response and good repetition as probe. It has a pH range from 0 to 14 with an accuracy of +0.05 pH. This package contains a meter, four LR44 button batteries and an operation manual.