Dissolved oxygen meter: Lutron do 5510 the polarographic type oxygen probe with an incorpo- rated temp. Sensor, high precision measurement for dissolved oxygen(do), oxygen in air(o2) and temp. Measurement. Heavy duty dissolved oxygen probe, probe head can connect with bod bottle. Automatic temp. Compensation from 0 to 50 ƒ for sensor probe. Build in " percent salt " and " mountain height " compensation adjustment button. Microprocessor circuit. Records maximum, minimum value. * This digital oxygen meter is supplied with a polarographic type probe with an incorporated temp. Sensor which serves for precise dissolved oxygen(do),oxygen in air(o2), temp. Measurement. Applications for aquarium, medical research, agriculture, fish hatcheries, laboratory, water conditioning, mining industry, schools and colleges, quality control.. Accessories included: Oxygen probe(oxpb-11) pc. Carrying case.1 pc. Operation manual 1 pc. Spare probe head with diaphragm oxhd 04. 2 pcs. Probe-filling electrolyte oxel-03.1 pc.