KYORITSU 3131A - Manual (Page 18)

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10. Cleaning of the Instrument
◎ Cleaning the meter cover
This instrument is managed by our company's quality standard and is
delivered in the best condition after passed the inspection. But in the dry time
of winter static electricity sometimes builds up on the meter cover due to the
characteristic of plastic.
When the pointer deflects by touching the surface of this instrument or zero
adjustment can not be made, do not try to make measurement.
When static electricity builds up on the meter cover and affects the meter
reading, use a cloth dampened with off-the-shelf anti-static agent or detergent
to wipe the meter cover surface.
11. Service
If this tester should fail to operate correctly, return it to your nearest
distributors stating the exact nature of the fault.
Before returning the unit, make sure that:
a) probes have been checked.
b) fuse has been checked.
c) battery has been checked.
Remember, the more information written about the fault, the quicker it will be
serviced.