digital pH meter, code no.: ATPH-3BW pH MeterFeaturesMulti-point push-button calibration (up to 3 point).Auto-buffer recognition.Viewing of electrode slope ... ±0.01pHmV Range±1999mVResolution1mVAccuracy±2mVTemp. Range0~99Resolution1Accuracy±1Calibration Points2 pointspH Buffer OptionspH4.00, pH6.86, pH9.18Temp. Compensation0~99, Manual ... (H)Power9VDC, using AC adapters 110VAC/220VAC, 60/50Hz pH Meter