Insta-TEST® Low Range Test Strips for Chlorine Dioxide Levels, 0-5 PPM, 50 Test Strips/Bottle

To test for chlorine dioxide levels in sanitized water, follow these simple steps: Immerse a test strip in a cup-sized sample of water for 2 seconds. Remove the strip with the pad facing up. Immediately compare the color of the strip to the color chart provided. Do not shake off any excess water from the strip. Discard the strip after 30 seconds. For best results, store the test strips in a cool, dry place to ensure accuracy.