DO PROBE Model : OXPB-11 * Exclusive dissolved oxygen probe for DO meter, DO-5510, DO-5511. DO-5519, DO-5510HA, PDO-520, DO-5512SD. * Optional dissolved oxygen probe for DO meter, DO-5510, DO-5511. DO-5519, DO-5510HA, PDO-520, DO-5512SD. * Output is used 4 pins DIN plug. * Cable : 4 meters. * Optional accessories : DO probe filling electrolyte , OXEL-03. DO probe head diaphragm set , OXHD-04.