[TR] non-contact laser thermometer

[Randall]

> Harbor Freight in the US has a non-contact laser thermometer for sale.
>  Anyone used any of these types with good results? They are on sale for
> $30

I have a slightly older one from HF, might not be the same model.  Seems to
work OK, with the standard caveat for "laser" thermometers: the displayed
value depends heavily on the emissivity of the surface you are shooting.
Aluminum in particular has a widely varying emissivity, so it's practically
impossible to get a valid reading from say an aluminum thermostat housing
unless you stick a spot of paint or tape on it.  Cloth-covered radiator
hoses also confound it.

-- Randall