At first I thought this was just a gimmick to sell naughty devices on eBay, disguised as being an electronic tool. But in reality, it works really well for the suggested application.
The idea is that a heater in a ceramic cup evaporates solid rosin, as used in solder flux, and allows you to deposit a layer of condensed droplets onto a faulty circuit board. This creates a white layer over the surface that re-melts when heated by a faulty component.
The white powdery coating is actually a layer of tiny rosin spheres that act a bit like reflective paint to create the white colour. When it melts with heat it converts back to liquid and exposes the hot component.
The search keywords for this device are:-
rosin atomizing pen
Target price around 12 £$€.
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