7-in-1 Test Strips by Water Treatment Hellas.

• Measurement of free chlorine, total chlorine, bromine, pH, total hardness, alkalinity, and cyanuric acid
• Package Contents: 50 strips

Instructions for Use:

• Dip the strip into the pool water for 2 seconds
• Hold the strip horizontally for 30 seconds without wiping off the water on the strip
• Compare the color of the strip with the color chart on the package
• Store the package in a cool and dry place