Experience precise chlorine measurement with the PL Chlorine HR 1. Designed for accurate testing, it measures high-range chlorine (HR) from 0 - 200 mg/l with a 1 mg/l resolution and sodium hypochlorite from 0 - 6 mg/l with a 0.1 mg/l resolution. This liquid reagent is perfect for 541 tests, ensuring reliable results every time.