Digital pH Meters model 101 and model 111 are ideal instruments for determination of pH and mV value of any aqueous solution. They use the latest microcontroller technology to provide the most accurate readings on the 31/2 digit display. The instruments can be calibrated using up to 3 point calibration on the click of a key. They have the facility of auto buffer recognition. The calibration is retained in the memory even after the instrument is switched off thereby eliminating the need for frequent calibrations as in conventional instruments. The temperature compensation facility, both automatic and manual is available in model 101. The measurement range is from -2.00 to 20.00 pH with a resolution of 0.01 pH. These are extremely useful instruments for agriculture and soil analysis laboratories, swimming pools, fertilizer plants, chemical industries, pharmaceutical industries, petroleum refineries, textile plants etc