The Hach DR300 Free and Total Chlorine Pocket Colorimeter is a portable and rugged Free and Total Chlorine photometer designed for portability and simplicity, that measures Free and Total Chlorine in water from 0.02 – 2.00 mg/L LR and 0.1 – 8.0mg/L HR. With an IP67 waterproof rating, it’s built to endure harsh conditions. Its intuitive interface is easy to navigate and the larger, backlit display allows for easy reading in any environment.