Triplett 9007-A - Manual (Page 41)

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9: MAINTENANCE
Your Triplett Model 9007-A 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
9.1 Replacing Battery:
9.1.1 Remove the test leads from the meter.
9.1.2 Remove 1 screw from the top of the battery
compartment cover. Flip the Stand out and remove the
screw from the bottom of the battery compartment
cover. The cover is sealed and may fit tightly. A small
screwdriver inserted at the top of the cover
may help to remove it.