Extech Instruments RF153 User Manual page 7

• If the temperature of the liquid that you
wish to measure is extreme, allow it to
settle to a workable temperature before
use.
• Do not use metal tools when sampling.
Metals can damage the prism surface.
• The prisms are coated for protection; do
not use acetone to clean the prism, as
this will harm the coating.
• After use, please follow the user manual
instructions for cleaning the prism. Close
the prism cover when storing.
• If the meter is to be stored for a long
period, remove the battery and close the
prism cover.
• Never use organic solvents for cleaning.
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RF153-en-GB_V1.1 11/18