I've tested a lot of thermal cameras, and this tiny one is easy to recommend
Briefly

The Thermal Master P2 thermal camera, touted as the world’s second smallest, is an essential tool for engineers and DIY-enthusiasts, allowing for quick and accurate thermal inspections.
With a 25Hz refresh rate, the P2 offers a superior viewing experience compared to slower models, complemented by a sensitive temperature resolution ideal for diagnosing HVAC issues and spotting electrical faults.
Read at ZDNET
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