Sensitivity Levels: 0, 0.25, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 15, 20, 25 mg/L Total Test time: 40 seconds The test strips are very reliable and have been laboratory checked to make sure they produce accurate results. They are also used in the medical industry to monitor cleaning of some medical devices. These test strips have a unique safety feature, which is called 'bleach-out' warning: if there is too much chlorine in the water they will go black. Bottle of 50 Free Chlorine test strips
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