The Oyster-10 from Extech simultaneously displays pH and temperature, or mV and temperature on a large LCD, which is built into an adjustable, flip-up cover. The display includes self-diagnostic codes to help users troubleshoot electrode, buffer and temperature errors. Measurements range from 0 to 14 pH with 0.01 resolution and accuracy, -999 to 999mV with 1mV resolution and 2mV accuracy, and 32-212