Perfectly for home users, laboratory technicians, environmental workers, and anyone concerned with water quality monitoring. These high precise test strips quickly measure water hardness, chlorine, and other vital parameters, delivering reliability result. Suitable for a variety of applications including home tap water testing, swimming pool maintenance, drinking water analysis, and natural water body surveillances. With 50 pieces per bottle, our aquarium test strips offer long last peace mind, helping you maintain the perfectly environment for your fish and plant., Manufacturer: Koolenry