For sale are two Knick Protos 3400(X) units, each equipped to measure pH, conductivity, and oxygen levels. These units are made by the renowned brand Knick and are sold as a unit type. Though they are used, they are in good working condition and have been tested to ensure their accuracy. These devices are perfect for those in need of pH, conductivity, and oxygen measurement in various industries, including business and industrial settings. Don't miss out on this great opportunity to enhance your measurement capabilities with the Knick Protos 3400(X) basic units.