The Extech Oyster-15 is a kit that features an exclusive Oyster design that can be used in the lab or in the field. It has a large LCD built into adjustable "flip-up" cover, which displays pH or mV and Temperature simultaneously. The splash proof housing and front panel tactile touch pad is used to control slope and calibration. Its rugged design for handheld or benchtop use. It Measures pH (0.00 to 14.00pH), mV (-999mV to 999mV) and Temperature (32.0°F to 212.0°F /0.0°C to 100.0°C), with an accuracy to 0.02pH, 2mV, 0.8°F/0.5°C and resolution of 0.01pH, 1mV and 0.1°. The memory function stores and recalls 25 labeled readings. An audible beeper alerts the user when a function is completed, with Automatic or Manual temperature compensation. This kit also includes mini pH electrode, calibration buffers (4 and 7pH) and carrying case.