I e-mailed the manufacturer yesterday, and got this back this morning:

The meter can be activated by any vibration.
If the plane sits outside and the wind is blowing and moving the plane it can collect time.
Or if the plane is towed on the ground it can record time.
The loop of wire that was cut when you installed the meter is used to short the meters vibration circuit.
If this loop is reconnected when the plane is not in use there will not be extra time logged on the meter.
Also the time recorded will not be affected by disconnecting and reconnecting this loop.
Some Customer tie it to a toggle switch.

If they're that sensitive I guess they aren't that useful. The Tiger Moth is in a hangar so the wind shouldn't be a problem.



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