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KL-91188/91189/91182/91183 Pen Type Conductivity/TDS Meter Model KL-91188 KL-91189 KL-91182 KL-91183 Measuring Range 0~1999 μS/cm 0~19.99 mS/cm 0~1999 mg/L (ppm) 0~19.99 g/L (ppt) Accuracy ±2% F.S. ±2% F.S. ±2% F.S. ±2% F.S. Resolution 1 μS/cm 0.01 mS/cm 1 ppm 0.01 ppt Automatic Temperature Compensation 0°C~50°C Operating Environment Temperature: 0°C~50°C; Relative Humidity <95% Battery 4×1.5V (AG13) Dimensions 150mm×30mm×20mm Weight 60g