Beta 1760/IR1000 Mode D'emploi page 38

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Locating a hot Spot
To find a hot spot aim the thermometer outside the area of interest, then
scan across with an up and down motion until you locate hotspot.
Reminders
1) Not recommended for use in measuring shiny or polished metal
surfaces (stainless steel, aluminum, etc.).See Emissivity.
2) The unit cannot measure through transparent surfaces suchas glass.
It will measure the surface temperature of the glass instead.
3) Steam, dust, smoke, etc., Can prevent accurate measurement by
obstructing the units optics.