These test strips are an unbeatable test system with no caps to worry about for even greater moisture protection.  Insta-Test® pool and spa strips will help you maintain proper free chlorine levels and balanced water.  The PopTop cap makes these patented vials easy to open and shut as well and protecting the strips from moisture.  Measures chlorine and bromine on one test strip by simply immersing in water, swirling it 3 times, removing it and immediately checking the sample information.  With 50 test strips per vial get the easy and convenient way to test your pool or spa water today!