ONLINE PH INDICATOR SANSEL make online pH indicator Model pH 641 is a precis, rugged and weather proof instrument carefully designed for the most accurate measurement of pH in all industries. These instruments are completely IC version using “MOSFET” input “OP -AMP” and CMOS ICs. This instrument is a panel mountable with a compact standard size of 48 x 96 x 65mm with front end potmeter type easy adjustable 4pH & 7pH buffer calibration option. This instrument operates from 90V to 270V AC / DC , 50Hz.
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