| http://www.w3.org/ns/prov#value | - The probe head 2731 a of pen 2731 can include a wall (not shown) positioned between sensor 2662 c and sensor 2662 d similar to the one described in FIG. 86. [1213] A variety of means can be used to increase the temperature gradient between the hot and cold junctions of a thermopile and increase the signal including using a power source to br
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