These J-QUANT® Chlorine test strips are used for determining the level of chlorine in solution, for example in tap water supplied in the UK via the mains water supply (where Chlorine levels should normally be below 1 mg/L). They provide a basic, easy to use, rapid test, with results typically within a minute or less. Range: 0 - 0.5 -1 - 3 - 5 mg/L Cl₂. Pack of 100 strips.