Vaisala HMW90 Serie Guide Rapide page 8

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Opening and Closing
To open, use a screwdriver to push down the tab that
holds the transmitter cover and mounting base
together. Pull the mounting base away from the cover,
starting from the top.
To close, connect the bottom of the transmitter first,
and tilt the top forward to close the tab. Closing the
transmitter starts it up if power is supplied to the screw
terminals.
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