20 RF153-en-GB_V1.1 11/18
Note that measurement data is not
automatically stored when an error
message is showing. Contact Extech if an
error is persistent and does not clear.
6. Maintenance
Cleaning the prism
Clean the prism surface immediately after
each measurement.
1. Use a cotton swab dipped in quality
alcohol (over 99%) and wipe in
concentric circles; avoid using acetone.
2. Use a dust-free cloth to wipe the surface
after using the alcohol.
3. Store in a dry and shaded area.
Cleaning the housing
Clean with soap and water using a damp
sponge or soft cloth.
Maintenance Notes
Do not use organic solvents to clean the
meter. Remove the batteries when storing
the meter. Close the prism cover when not
in use.
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