Harvard Apparatus”s Model 211 pH meter supports pHs from zero to 14 +/-0.01 and temperatures from 0 C to 100 C +/-0.5 C. The meter also measures mV from +/-399.9 mV and +/-1,999 mV with ISE and ORP electrodes. A large display shows both pH (or mV) and temperature simultaneously. The display screen also shows step-by-step operation, allowing users to easily follow the measurement process. A microprocessor supports calibration and provides automatic buffer recognition.