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An oxygen sensor is an electronic device developed by Volvo Car Corporation in the mid 1970s that measures the proportion of oxygen (O<sub>2</sub>) in the gas or liquid being analyzed. The sensing element is usually made with a zirconium ceramic bulb coated on both sides with a thin layer of platinum and comes in both heated and unheated forms. The most common application is to measure the performance of internal combustion engines in automobiles and other vehicles. Divers also use a similar device to measure the partial pressure of oxygen in their breathing gas.