How to Choose an Infrared Thermometer

Infrared thermometers provide quick non-contact surface-temperature checks when their limitations are understood.

What matters

• Check the temperature range required by your work.
• Compare distance-to-spot ratio for the target sizes you measure.
• Understand that shiny surfaces can produce misleading readings.
• Do not confuse an IR surface reading with internal temperature.

How to think about the job

An infrared thermometer estimates surface temperature from emitted infrared energy. Distance-to-spot ratio determines how large an area contributes to the reading. Emissivity and reflective surfaces can affect accuracy, so use the manufacturer's guidance for the material and application.

Before you buy

Match the tool to the equipment, fastener, environment, and manufacturer's requirements. Specifications and included accessories can change, so confirm the current product listing before ordering.