The VWR® Digital Free Chlorine Photometer is a portable, easy-to-use colorimetric photometer for the rapid and accurate measurement of free chlorine, total chlorine, combined chlorine, and additional water quality parameters including pH, turbidity, and other analytes depending on model. Using a DPD (N,N-diethyl-p-phenylenediamine) colorimetric reagent method (compliant with ISO 7393-2 and Standard Methods), the instrument delivers precise chlorine readings within seconds. Key features include: IP67-rated waterproof and dustproof housing for field use, wide measurement range (0–5 mg/L free chlorine, extended ranges available), digital display with backlight, automatic blank subtraction, factory calibration with NIST-traceable standards, on-board data storage with time and date stamp, USB or Bluetooth data export, and a rugged carrying case. Suitable for drinking water testing, swimming pool and spa monitoring, cooling tower water management, food and beverage production water quality control, and hospital sterile service departments. Compliant with drinking water monitoring regulations and HACCP water quality programmes.