| http://www.w3.org/ns/prov#value | - For example, if used only to measure frozen precipitation, the microprocessor 21, light sensors 18 or light sources 16 may be powered when the temperature sensor 20 measures the ambient air temperature at some predetermined temperature such as 35??? F. Upon sensing a predetermined temperature, the temperature sensor 20 activates a switch to power the microprocessor 21, light sensors 18 and light s
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