Features Quick and easy Dip the pool water test strip into the water for 2 seconds, remove and place the strip horizontally for about 15s, then match the color of the strip to the back of the bottle to get the reading, only 17s.Pool Spa Bath and Health Test strips for swimming pools, spas, hot tubs Water quality testing, you can ensure that the right amount of chemicals are kept in the pool to avoid health problems and equipment damage. Longterm economic use hot water bath strips, sealed, do not worry about accidentally wet other strips. No need for private lab testing or mailing analysis. Wide range of applications Pool water test strips can help you test the water chemistry of swimming pools, spas, and hot tubs to keep your pool water healthy and clean.DescriptionPool test strips can simultaneously detect 6 chemicals including PH, total chlorine, chlorine, total alkalinity and total hardness.SpecificationsType pH test stripModel PH077Uses total hardness, total chlorine, pH, total alkali, bromine, chlorinecolor WhitePackage Included50 * pH test stripNotes Due to differences between different displays, the picture may not reflect the actual color of the item. Physical errors may exist due to different personal measurement techniques. Thank you