| http://www.w3.org/ns/prov#value | - Alternately, a non-contacting probe may be used in conjunction with a thermistor, thermocouple, bi-metal based or other temperature sensing device located on the heating surface to measure the temperature difference between the item and the heating surface.The individual heating surfaces, such as the upper plates 16 or other portions of the trays 12, may additionally contain a strain gauge, proxim
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