The Model 701A digital pH/mV meter is the ideal meter for all research and precision measurements with pH and chemical sensing electrodes. In both the absolute and relative mV modes, the meter covers a range of ± 1999.9mVwith ±0.1 mV precision. The relative mV scale has a calibration potential of ± 200 mV. For pH measurements the meter offers a 0.01 pH scale with ±0.01 pH relative accuracy and a 0.001 pH scale with ±0.001 pH relative accuracy. The 701A has a bright, long lasting LED display with automatic sign indication that eliminates interpolation and reading errors. It has an analog recorder output with span control and a parallel BCD digital output which permits the 701A to be used with compatible digital printers. A 10µA current is available for Karl Fischer titrations. Circuitry in the 701A is completely solid state, and the meter features high In- put impedance along with extremely low drift. Operation of this versatile research tool Is simple. We suggest that you read the entire instruction manual before attempting operation. This will familiarize you with the meter's controls and outputs, as well as give you an Idea of the meter's potential uses.