Simply dip the test strip into the pool or spa and compare it to the color chart to check if the levels are within the appropriate range. Get three important test results in just one dip!Manage proper levels to ensure the water that is clean and healthy. AquaChek Peroxide 3-in-1 also measures pH and Total Alkalinity levels which helps guard against scale formation and/or corrosion that can occur with changes in your water’s pH. Maintaining appropriate levels will help ensure that bacteria and other contaminants are eliminated, leaving spa water clean and healthy. Comes with 25 test strips per bottle.Tests For: