Mokesta wrote:
Nice and cheap that!
As the text in the link states, these fixed emissivity readers are only correct for rough, dark surfaces. For a tyre they would be great. For the surface of a brake rotor they would be quite inaccurate. For things in between like a hot exhaust, their accuracy would depend on the surface coating of the object being measured.
Just because it has a digital readout with many digits doesn't meant the number is right.
M
The reading I've done (which I'm damned if I can find now) indicated that while they are less accurate measuring 'reflective' surfaces, this error will be quite small %-wise. This seems to be the case testing the unit I have - if I check a variety of surfaces sitting at room temperature, including everything from gloss tiles to wood to paper to carpet, the variance is less than half a degree. This has been true outside in winter (less than 10c) and summer (over 30c inside).
