fluke 561 infared thermomether

The device in the image is a Fluke 561 IR Thermometer, a dual-purpose tool designed for both non-contact infrared (IR) surface temperature scans and contact temperature measurements using a thermocouple. 

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Key Functions & Specifications

Measurement Range: Measures surface temperatures from -40°C to 550°C (-40°F to 1022°F).

Targeting: Uses a single-point laser to guide you to the approximate center of the measurement area.

Distance-to-Spot Ratio (12:1): At 12 inches away, the tool measures a 1-inch diameter spot. For best results on smaller objects, use it within 6 feet (1.75 m).

Advanced Features: Provides MIN, MAX, and DIF (differential) functions on its backlit display to help quickly identify temperature variations.

Contact Probe: Includes a K-type thermocouple (often a Velcro pipe probe) for internal or surface contact measurements, and is compatible with other industry-standard K-type probes. 

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Basic Operating Instructions

Power On: Pull the green trigger to turn the device on.

Take a Reading: Aim the thermometer at your target and pull and hold the trigger. The laser indicates the center of the measurement zone.

Hold Reading: Release the trigger to freeze the reading on the display for 7 seconds (indicated by "HOLD" on the screen).

Emissivity Adjustment: Use the emissivity selector to toggle between Low (0.3), Medium (0.7), or High (0.95). Use "High" for most organic materials and "Low" for shiny metal surfaces to improve accuracy.

Switching °C/°F: Locate the small switch inside the battery compartment to toggle between Celsius and Fahrenheit. 

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Quick Tips for Accuracy

Shiny Surfaces: Shiny metals reflect IR energy and can give falsely low readings. You can apply black electrical tape to the surface and measure the tape's temperature for a more accurate result.

Acclimatization: If moving the tool between significantly different environments (e.g., from a cold truck to a hot boiler room), let it sit for about 30 minutes to stabilize before taking critical measurements.

Clean Lens: Keep the lens free of dust and fingerprints by gently wiping it with a moist cotton swab.