Kelilong offers Digital pH Controllers, KL-201. Features: wall mount & hand-held type, professional quality; resolution : 0.01 pH; accuracy : +/-(0.1%+2 digits) after calibration; calibration : external pH4 (Slope), pH7 (Cal.); set range : 3.5 to 10.5 pH; relay contact : 5A/240 VAC; power supply : AC110V, AC220V 50/60 Hz.; power consumption : 2 W approximately; dimension : 150 x 85 x 40 mm. Applications include aquariums, aquacultures, beverage, fish hatcheries, food processing, photography, laboratory, paper industry, swimming pool, plating industry, quality control, Water Conditioning, School & colleges. Digital pH-ORP controller, digital ORP controller & digital conductivity controller are also offered.