Specifications Primary Specs     Range   Resolution   Accuracy   pH   -2.00 to 20.00 pH   0.01pH   ± 0.01 pH ± 1 LSD   ORP   -2000 to 2000 mV   1.0 mV   ±0.05% mV of rdg(range) ± 1 LSD   Temp   -10.0 to 120.0 °C   0.1 °C   ±0.5 °C ± 1 LSD         General       pH Temp Compensation   Auto/Manual -10.0 to 120.0 °C   pH Buffer Recognition   (4.01,7.00,10.01) or (4.00,6.86,9.18)   pH Buffer Temp. Range   0 to 60 °C   pH Electrode Offset Recognition   ± 90 mV at pH 7.00 or 6.86   pH Electrode slope Recognition   ± 30% at pH 4.01,9.18 or 10.01   Input Impedance   >10exp(13) ohms   Power Supply   Batteries or AC adapter   Calibration Backup   EEPROM   Audio Feedback   All Touch Keys   End Point Sensing & Hold   Yes   LCD Size (pH/mV:Temp)   16 mm: 21 mm high LCD   Ambient Temp. Range   0 to 50 °C   Relative Humidity   Up to 95%   ATC Probe   Thermistor,10K ohm   Dimensions (W x D x H)   230 x 165 x 80 mm