DeFelsko PosiTector DPM v.3.1 Full Manual - Manual (Page 11)

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To ensure optimal performance of your PosiTector DPM, do not
obstruct the airflow near the air temperature and humidity sensors.
Keep fingers away from the sensor, as body heat can cause
incorrect readings. Allow time for the Gage to acclimate and for the
readings to stabilize when moving the Gage between different
environments.
When using the surface temperature probe, do not use excessive
downward force, and do not drag it sideways. When the Gage is
not in use, place the plastic cap over the surface temperature
sensor to prevent damage.
Additionally, the PosiTector accepts a number of probe
types including magnetic and eddy current coating thickness,
ultrasonic coating thickness, surface profile, environmental and
ultrasonic wall thickness probes. For best accuracy, ensure your
Gage has the latest software Updates (pg. 27) before measuring
with a new probe. For the latest information about probe
interchangeability, visit www.defelsko.com/probes.
CAUTION:
NOTE: