Extech Oyster-10 pH/mV/Temperature MeterThe Extech Oyster 10 pH mV Temperature Meter is a portable and rugged measurement device designed for both laboratory and field use. Its exclusive Oyster style design features a large, flip up LCD display that shows pH or mV and temperature readings simultaneously. The splash proof housing and front panel tactile keypad allow for easy calibration and slope adjustment. With measurement ranges of 0. 00 to 14. 00 pH, 999 mV to 999 mV, and 32. 0F to 212.