Thermal cameras have long been either expensive or terrible, and the P2 is neither: a plug-in module for Android measuring 27 x 18 x 9.8mm that still produces 512 x 384 infrared images with 15x zoom across roughly -4F to 1,112F. It draws power from the phone's USB-C port, so there is nothing to charge and nothing left behind when you need it. The use cases are the unglamorous ones that matter — a draughty window frame, an overworked circuit breaker, a stud behind plaster, or a cat hiding under a car in the dark.

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