I bought one of these 12 or so months ago. They have one huge
drawback, in that the infra-red emitted by a body is influenced by the
surface finish of said body as well as its temperature.
For example, last week I was checking the temperature of the
external surface of a twin walled flue pipe, which is galvanised, the
thermometer showed about 22°C. I taped a piece of black paper to the
flue, it then measured about 140°C, which was somewhat nearer to the
The thermometers are calibrated to read accurately on a
"neutral" background, similar to the grey cards that are used for
accurate photographic exposures. Different surfaces emit different
levels of infra-red at the same temperature, so allowances (and care)
have to be made...
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