pH range: -2.000 to 16.000pHpH accuracy: ±0.002pH Resolution: 0.001pH Ion concentration range: 0 to 19,999ppmIon concentration accuracy: ±0.5%Resolution: 1ppm mV range: 0 to ±1,999.9mV mV accuracy: ±0.2mVTemperature range: 0 to 100˚C, 32 to 212˚F Temperature accuracy: ±0.3˚CpH calibration points: 2 points, NIST, pH4.00/6.86/9.18 or USA, pH4.01/7.00/10.01Ion calibration points: 2 points Temperature compensation: 0 to 100˚C, 32 to 212˚F, automatic or manualBuilt-in ion mode: Na, Ag, K, NH3, CL, F, Ca, No3, Pb, I, Cu, Br, and CN Memory: 99 data sets with date/time stampingOutput: USB communication interfacePower requirements: 9V DC, using AC adapters, 220V AC, 50Hz Dimensions: 210 x 188 x 60mmWeight: 1.5kg