Overview PHS type digital pH meter is a precision instrument used to measure the PH value of the laboratory, with pH, ??mV dual function. E201 uses composite electrode, fast response and good stability. The meter is widely used in research, teaching, agriculture and many other disciplines and fields. Works by the sensor (pH combination electrode) aqueous solution of hydrogen ion activity into electrical energy, electrical energy input to the instrument, after the op amp, galvanometer, the A / D converted into a digital display. More energy in line with the Nernst equation: Technical parameters Instrument Model PHS-25C PHS-2C PHS-3C pH measuring range 0.00 ~ 14.00pH 0.00 ~ 14.00pH 0.00 ~ 14.00pH pH Accuracy ± 0.05pH ± 0.02pH ± 0.01pH Resolution 0.01pH 0.01pH 0.01pH mV measuring range 0 ~ ± 1999mV 0 ~ ± 1999mV 0 ~ ± 1999mV mV Accuracy ± 10mV ± 10mV ± 2mV 1mV 1mV 1mV resolution temperature compensation range 0 ~ 60 ℃ 0 ~ 60 ℃ 0 ~ 60 ℃ standard buffer solution pH4.00; PH6.86; pH9.18, power type power supply adapter, or power cord Dimensions 220mm × 200mm × 85mm Weight Approx 1KG