Most low cost infrared thermometers have a 6 to 1 or 8 to 1 distance to spot ratio.
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IRT650 Infrared Thermometer Specifications:
Measurement Accuracy: 5.4°F (3°C) from -25° to -4°F (-32°C to -20°C); 3.6°F (2°C) from -4° to 212°F (-20° to 100°C); 2% of reading from 212° to 999°F (100° to 535°C)
Measurement Resolution: 0.1°F (0.1°C)
Response Time: 0.5 seconds
Operating Temperature: 32° to 122°F (0° to 50°C), 10 to 90%RH
Auto Power Off: Automatically after approx. 6 seconds
Battery Life: 16 hours (typical)
Powered by: "9V" battery (included)
Weight: 5.8 oz. (163 g) Approx.
IRT650 Infrared Thermometer Includes:
Soft carrying case
One Year Limited Manufacture's Warrany
Made in Taiwan (TAA-complaint)