Amprobe TMA-21HW Hot-Wire-Anemometer - Manual (Page 26)

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Except for the replacement of the battery, repair of the meter should be
performed only by a Factory Authorized Service Center or by other qualified
instrument service personnel. The front panel and case can be cleaned with
a mild solution of detergent and water. Apply sparingly with a soft cloth and
allow to dry completely before using. Do not use aromatic hydrocarbons or
chlorinated solvents for cleaning. If the meter is not to be used for periods of
longer than 60 days, remove the batteries and store them separately
Cleaning
Periodically wipe the case with a damp cloth and mild detergent.
Do not use abrasives or solvents. Clean and dry as required.
Trouble Shooting
If the instrument fails to operate, check batteries and test leads
etc., and replace as necessary. Double check operating procedure as
described in this user’s manual.
Battery and Fuse replacement
Battery use :
Standard 1.5V AAA Size (NEDA 24G or IEC R03) battery X 6
Battery replacement :
Loosen the 1 screw from the battery access door of the bottom case. Lift
the battery access door and then the battery compartment up. Replace the
batteries. Re-fasten the screw.