The Elcometer 214 Infrared Digital Thermometer has a spot ratio of 3:1. The closer you get to the object under inspection, the smaller the spot size and hence the more accurate the reading.
The diagram explaining optic (spot) ratios is shown below:

Temperature Range |
-18 to 315°C |
Resolution |
1°C |
Accuracy |
+/- 2% of reading or 2°C |
Ambient Temperature Range |
10 to 52 °C |
Field of View |
3:1 Optics Ratio with a 25mm Minimum Target |
Repeatability |
+/- 0.5 % of reading +/- 1 digit |
Wavelength |
8 to 14 microns |
Emissivity |
Fixed at 0.95 |
Response Time |
1 second |
Display |
3 digit - 10mm Liquid Crystal Display |
Battery Type |
9V MN1604 Alkaline Battery |
Battery Life |
Approximately 100 hours |
Case Dimensions |
184 x 43 x 19mm |
Instrument Weight |
77g (without battery) |
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