KYORITSU 3316 - Manual (Page 23)

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8−5 Cleaning 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 static builds up on the meter cover and affects the meter
reading, use a cloth damped with off-the-shelf anti-static agent
or detergent to wipe the meter cover surface.
CAUTION
¡ When the pointer deflects by touching the surface of this
instrument or zero adjustment cannot be made, do not try to
make measurement.
¡ Antistatic agent has been applied to the meter cover of the
instrument for electrification prevention, therefore, do not rub it
strongly with a dry cloth etc. even if it is dirty.
¡ To avoid possible deforming or discoloring, do not use
solvents.