With its small footprint (18” wide x 9” deep), our Counterlab Rx 2 is the ideal choice for retailers looking to maximize valuable counter space. The ferrous ammonium sulfate DPD chlorine test will detect combined chlorine as low as 0.2 ppm and will not bleach out in super chlorinated water up to 20 ppm. Each lab comes with timesaving testing tools such as the SpeedStir® magnetic stirrer, Daylight Comparator Lamp, and Watergram® Water Balance Calculator. This kit tests for total alkalinity, calcium hardness, pH, total bromine, cyanuric acid, and free and total chlorine.