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no, they typically arent accurate enough for that
I have one of these and they are known to be quite accurate, you can even change the settings for emmissivity for measuring different surfaces: http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXEMG5
Just thought I'd throw that out there. Since people might come here looking for the temp gun, the towerhobbies temp gauge is usually always $25. It seems to be more accurate based on what I'm reading of reviews of the rosewill. For example, people are reporting +-2 degrees when measuring the same object from the same place. That doesn't happen with the DuraTrax
They are intended to be used to check the operating temperature of nitro engines for RC cars, and mine works quite well from around -5F (lowest i've measured with it) to around 300 (the engines run around 270) and I've measured 400s on pans/cooking (once you get one you measure everything). Temp range is -27-428F (-33 to 220C)
Someone is looking at me!
As with any thermal device, it's all about calibration or learning the devices inaccuracy so that you can compensate for it. If a normal tongue is 98.6 and the meter says 98.1 then you know to consider .5 higher in all measurements gets you closer.
