Measuring SMT device temps with Infrared thermometers

Anyone have any experience with using handheld Infrared thermometers
to measure small SMT devices? I see some devices for $30 and up.

It is possible to adjust for the emissivity differences between
different materials?

What about the ability to focus on a specific device? Like a SOT23?

We have a very expensive infrared camera which is often used to
determine temperatures across an entire circuit board. This is ideal
but inconvenient.

Thanks,

.

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