QIUSUO Benchtop Water Hardness Meter with Standard Calibration Solution Range Concentration 0.05 to 200 mmol/L Resolution 0.001,0.01,0.1,1,Automatic

QIUSUO Water Hardness Meter with Standard Calibration Solutions Range 0.05 to 200 mmol/L Resolution 0.001, 0.01,0.1,1