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19. 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. Do not
clean with abrasives or solvents. Use mild
detergents; never immerse nor use excessive
fluid.
20. 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.
21. BATTERIES
If there is no display when the thermometer is
turned on, check condition of the t h r e e 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.
