Used buffer

Tlead Portable Water Hardness Tester YD300

• Manufacturer: Tlead

Measuring Range: 0~10mmol/L; 0~401mg/L (Ca); 0~1000mg/L (CaCO3); 0~100ºfH (France Degree); 0~561mg/L (CaO); 0~56ºdH (German Degree); 0~20mmol/L (Boiler); 0~70ºeH (England Degree)