The SenSafe® Silver test strips test for free Silver in water. This strip uses our patented aperture technology to detect levels from 5 ppb (µg/L) (.005ppm (µg/L)) to 100 ppb (µg/L) (.1 ppm (µg/L)) in 30 seconds, making Boris Silver ideal for a wide range of industries. Available in bottles of 50, Boris's Silver test strips are safe to use with no hazardous chemicals and no SDS is required. Glycine allows for the elimination of chlorine interference when detecting silver in water. This product is great for testing naturally occurring silver, silver ionizers or silver used as a bacteriostat in water filters. Does not detect Colloidal silver.