build ATC sensor, economic type PEN pH METER Model : PH-223 * 0 to 14.00 pH. * ATC ( auto temperature compensation) . * Auto calibration for pH 4, pH 7 or pH 10. * Meter with pH electrode, ....
pH MONITOR Model : PH-321M * 0 to 14.00 pH x 0.01 pH. * Accuracy : 0.1 pH ( pH 4 to pH 10) . * Auto calibration for pH 4, pH 7 or pH 10. * LCD display with back light * Power supply : DC 9V....