"push and hold to test weekly".

I saw this on a Kidde smoke detector.

Pushing the test button tests the smoke detector weakly. It just tells you the horn and battery are functioning. It doesn’t test the smoke sensor.

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From what I read, some companies claim to have the test button test the chamber in some way or fashion.
I’ve been looking into whether or not this is actually true.

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Not sure about that myself, in any case though it’s still better to test the unit with actual smoke, such as smoke in a can for example, to make sure the sensor will pick up said actual smoke.