main switch has to be switched off and then on again in order to
use the instrument.
3. Changing Batteries. Open the compartments in the base of the
instrument, replace the old batteries with new ones, and close
the compartment covers. Use 9 volt alkaline batteries (Duracell
MN1604 or similar).
NOTE
Do not use mercury, air or car-
bon-zinc batteries.
3
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