... Range---0~±1999mV ORP Accuracy---±2mV Temperature Range0~100.0oC, 32~212oF Temperature Accuracy±1oC, ±1.8oF Resolution 1oC pH Calibration ... USA, pH4.01/7.00/10.01 Temperature Compensation0~100oC, 32~212oF, Automatic or Manual Memory50 data sets OutputUSB Communication interface ... hours of continuous use Dimensions185(L)mm×88(W)mm×32(H)mm Weight300g Digital Portable pH/ mV/ oC/ oF Meter ...