Salt meter capable of highly accurate measurement of salt content from 0.1% to 5.0% Waterproof type that can be washed when dirty - Brand: dretec - Model Name: Salt Meter - Measurement Range: 0.1%〜5.0% - Accuracy: 0.1% Only used for photography. When I tried to photograph the instruction manual for the listing, some moisture from the table got on it (photo). Operation confirmed. Recommended for those with high blood pressure.