KL-100 Digital pH Controller Technical Specification: Model KL-100 Measuring range 0.00~14.00PH Accuracy ?.02PH Resolution 0.01PH Set Range 3.50～10.50PH Relay contact 5A/240VAC Environment Temperature:0~50℃ Humidity<95℅ Display 4-digital LED Input Impedance 1012Ω Power Supply 220V?0℅ 50Hz?℅ Dimensions 108?10?8 (mm3) Weight 550g