Triplett 9055 - Manual (Page 13)

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2.26 Do not use the meter if either the meter or the test
leads are wet, either from exposure to the weather,
or after cleaning the case of the meter. Doing so
may cause injury to the user.
2.27 Do not attempt immediate use of the meter when
bringing it from a cold environment to a warm
environment. Condensation of water, inside and
outside of the meter, may produce dangerous
measuring conditions. Allow the meter to warm to
room temperature before using. Failure to observe
this precaution may result in damage to the meter
or injury to the user.
2.28 Do not modify the meter. Changing the design may
make the meter unsafe and may result in injury to
the user.
2.29 Use caution when attempting to evaluate if a
dangerous voltage is present. The meter will not
read AC voltage if it is set to DC, nor will it read DC
it is set to AC. For example, if the meter is set to
VDC, it will not measure a dangerous AC voltage,
even if the probes are inserted into a household AC
wall outlet.