Motion detector test tip:
To map out the detection zone for any IR-based motion detector, fill a small plastic bottle (e.g. a pill bottle that seals well) with boiled or hot water, and duct tape it to the end of a long stick. Standing out of range of your sensor, gradually work your way in, waving the hot point around until it triggers. This may be more useful information to someone using PIRs to track the movement of small warm-blooded mammals, but whatever.
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