Those buttons on those units only tests the electronics of the devices.
To test if the alarm will actually sense LP, take a butane fire starter, light it then while still holding the trigger, blow it out and hold it close to the detector. In a few seconds the detector should alarm. That way you know it will sense gas.
You can also use a small propane torch not lit to do the same thing.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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