Peroxide (H2O2) Check water quality test strips measure a broad range of concentrations with a single test method. They provide accurate results from 0.50 to 100 ppm (mg/L) in under one minute, making these test strips ideal for a wide range of industries interested in water quality testing. Simply dip the Test Strip into your water sample for 2 seconds. Remove the strip and shake to remove excess water. Wait 30 seconds and match with the closest colour on the colour chart.