About Infrared (IR) Thermometers: Distance to Spot Ratio – Sper Scientific Direct
Flir TG54 IR Thermometer with 24 to 1 Distance to Spot Ratio and Color Screen | ValueTesters.com
Infrared Thermometer High Temp Thermometer Pyrometer -58℉~2732℉ (-50℃ to 1500℃), 30:1 Distance Spot Ratio, Non-Contact Dual Laser Thermometer for Industry Forge【NOT for Human】-AP-2732(Orange) - Walmart.com
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