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21. MAINTENANCE
Properly used, the thermometer should
maintain calibration indefinitely and not
require service other than occasional
cleaning of the housing and changing of
the batteries.
22. CLEANING
WARNING:
TO PREVENT IGNITION OF A
HAZARDOUS ATMOSPHERE BY
ELECTROSTATIC DISCHARGE,
CLEAN WITH DAMP CLOTH.
Do not clean with abrasives or solvents.
Use mild detergents, never immerse nor
use excessive fluid.
23. BATTERIES
If there is no display when the
thermometer is turned on, check condition
of the three AA batteries. Also check that
the battery terminals are clean and
batteries are properly installed. If
replacement is necessary, refer to the
BATTERY INSTALLATION AND
REPLACEMENT section for replacement
procedure.
