These test strips for pools and spas are 4-in-1 with a color comparative chart on the bottle, easy-to-use chlorine indicator to help others ensure that water is safe for those most in need. A simple, easy-to-read test strip for testing for accurate levels of chlorine.

Features
Each canister contains 50 test strips
Test strips measure for chlorine, pH, alkalinity and bromine
This provides the highest accuracy and precision for measuring chlorine

Dimension(s): 1" high x 1" wide