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environments. The indoor sensor is less
responsive to ambient air currents because
of the shielding effect of the display's
case. In addition, the case can act as a
heat sink to absorb and store heat from
external sources (i.e. handling of the case
or radiant heat). Also, the much greater
range of the outdoor temperature sensor
requires a different calibration curve than
the indoor range. Error is usually greater
at the extreme ends of a range, making it
harder to compare different ranges with
different curves. Under non-laboratory
conditions, it is difficult to compensate
for the above factors and obtain an
accurate comparison.