When washed efficiently, it will wash away the dark colored coating from the stainless steel strip. Washer disinfector efficiency soil tests require a stainless steel PCD to be used (C-1062). The washer disinfector soil test should be checked and recorded weekly. Specifications: - Ready to use. - It is easy to read and interpret. - The test provides efficient and reliable results. **For further product information, please contact Chat Support**