Triplett 9055 - Manual (Page 38)

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Note:
The AC Voltage Sensor will not work in all situations.
Metal in the vicinity can block the AC signal. Phase
cancellation may make it appear as if no AC is present, when
in fact dangerous AC is present. Bright sunlight may make it
appear as if the LED is not lit. NEVER RELY ON THE AC
VOLTAGE SENSOR TO INDICATE IF DANGEROUS
VOLTAGE IS PRESENT. DOING SO MAY RESULT IN
USER INJURY.
It is normal for the AC Voltage Sensor LED to light when
measuring AC voltages with the test leads.
7. MAINTENANCE
Your Triplett Model 9055 DMM is a precision measuring
instrument and, when used as described in this manual,
should not require maintenance.
However, periodic calibration of the meter will insure that it is
accurate and performing in accordance with its design
specifications.
A one year calibration interval is suggested.
To clean the outside of the meter, use a cloth dampened with
a mild detergent solution. Do not use any abrasive cleansers,
or chemical solvents that may damage the case of the meter.