The Horiba LAQUA 9551-100D (3014047091) Dissolved Oxygen Electrodes, For Field Immersible Type, 10m Cable. For field use, immersible, 10m cable. Operates with replaceable DO tip 5401 and built-in temperature sensor. For field use, immersible, 10m cable Operates with replaceable DO tip 5401 and built-in temperature sensor Waterproof.