2
3. Remove the battery cover and remove the old batteries if
necessary.
4. Install the new batteries, ensuring correct polarity alignment
(figure 1).
5. Place the battery cover on the back of the instrument and
tighten the four screws. Do not over-tighten.
Figure 1. Pro20/Pro20i with battery cover removed.
Notice battery symbols indicating polarities.
The waterproof instrument case is sealed at the factory and
is not to be opened, except by factory-authorized service
technicians. Do not attempt to separate the two halves of the
instrument case as this may damage the instrument, break the
waterproof seal, and will void the warranty.
i
KEY PAD
Figure 2, Keypad
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3
4
5
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