Professional, field-proven DO meter with backlit graphic display for portable application, including data logger and USB interface, set including CellOx® 325. The meter with carry case includes a galvanic DO sensor, CellOx® 325, an electrolyte, three exchange membrane heads, a stand, and a beaker. Includes short instruction manual, batteries, and USB cable. Please order the cleaning solution RL-G 205204 separately.