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Range PH:0.00-14.00PH EC:0-1999us/cm 0~19.99mS/cm TDS:0-1999ppm 0~19.99ppt Temp:0~50℃ Resolution PH:0.01PH EC:1us/cm(1999 us/cm) 0.01mS/cm TDS:1ppm(1999ppm) 0.01ppt Temp:0.1℃ Accuracy PH:±0.02PH EC:±2%F.S TDS:±2%F.S Temp:±0.5℃ Automatic Temperature Compensation:0℃~50℃ Battery Type:3X1.5V(AG13)(not included) Operating Temperature:0℃~50℃ Calbration:Two points(4.01,6.86)or One point(6.86)calibration Auto-off:After 8 minutes Dimensions:188mmx35mmx35mm Weight:98g When purchasing the instrument, please pay attention to the parameter information of the product.