Available on Request Precision Precision Active Chlorine Test Strip, CHL-2000, 2000ppm, 64 x 5MM, PK100 The Active Chlorine test strip tests levels of free chlorine in a solution. The increments are 0, 25, 50, 200, 500, 800, 1500, 2000ppm. The color chart has obvious color changes from blue to brown to... Available on Request Quick view Qty in Cart: 0 Price: Out of Stock Subtotal: Available on Request