The DO600-K is a compact kit that offers adaptability for measuring dissolved oxygen in laboratories or out in the field. It includes a 16-foot (5m) extension cable and a probe weight guard for easy measurements in tanks or streams. Includes ExStik® II DO meter, DO electrode, protective sensor cap, DO603 replacement membrane kit, 16-foot (5m) extension cable, weighted probe guard, four 3V CR-2032 batteries, 48-inch (1.2m) neck strap, and durable carrying box.