For accuracy: There is in measurement errors and systematic linearity error. A systematic arises eg when the zero point is incorrect, and therefore the thermometer constantly shows eg 2 ° too. Linearity errors occur when the device incorrectly indicates differently depending on the desired value, eg by 2% "next" is, or "undervalued" higher temperatures.
In the description thus an accuracy of +/- 2 ° C or +/- 2% is given, which comes "less favorable" value to bear. Say: below 100 ° C are's +/- 2 ° C, and about just 2%, which then accounts for +/- 4.4 ° C at 220 ° C.
Successive measurements therefore not fluctuate to such as +/- 2 ° C, but in the worst case by a tenth degree: But that does not mean that the measured values to these values STREWED are. As already wrote a Vorrezensent, the accuracy in comparison measurements is therefore an order of magnitude better.
I have in my watch an electronic thermometer that also displays tenths of a degree. I can certainly use if necessary as fever thermometers, because I have "calibrated" it with a thermometer from the pharmacy, and therefore knows that there is too much indicates where small temperature range of 5 ° C to 0.4 ° C.
As thermometer you will the device naturally can not use, and it occurred to me in a hurry no test object with a defined temperature. Water (from the tap), for example, does not boil at 100 ° C, at least not at 180m above sea level, and not when it (an unknown quantity) lime is solved. The water temperature I can also not be measured directly, because otherwise the lens would fog up, but only the surface temperature of the pot or glass, etc.
What I have measured with the device so far, but is in line with what I expected based on measurements with other thermometers, much better agreement than indicated in the description and the MPE. Maybe because I have caught a particularly accurate device within the manufacturing tolerances, or the provider promises a fair, not everything under the sun. Or both.
I want to clean up here with the myth that "lasers" are more accurate. The laser has only the sense of being able to aim precisely on the object being measured. That makes sense for devices with which you want to measure from a distance, and such devices have a magnifying optics.
This device has no magnifying optics. One can thus not any objects "flash", but the measured value is the average of all temperatures of a measuring circuit with the same diameter as the distance from the thermometer: If you are using the device as wine thermometer, you should proceed ran very close. Also works at festivals, where you put the drinks in the Freezer: A measurement of the bottle label or the can at any drinks informed about the progress of cooling :-)
For completeness, nor an indication of the "emissivity": The temperature of a body results ultimately from the wavelength of maximum IR emission. The can be measured though, these devices but I would of price, volume, weight and see her only in physical laboratories. The "handy" devices entering into a physical compromise, which, strictly speaking, accurate work only at a theoretical, ideal blackbody. This thermometer is fixed at an emissivity of 0.95. In the manual is also pointed out that it is not suitable for reflective metal surfaces. This can be circumvented by simply aufklebt a paper label, and its surface temperature measures, because if one wants to measure something. In my measurement objects that used to be a rather academic argument.
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