Fluke 566 Thermal Infrared and Contact Thermometer

Published on Aug. 3, 2023, 7:47 a.m.

Introduction to Thermal Imaging Technology

Thermal imaging technology is an advanced technique that generates images by detecting the infrared radiation emitted by objects. All objects emit infrared light to varying degrees, and thermal imaging cameras can capture and convert this radiation into visual images. This technology finds widespread applications in medical diagnostics, building structure inspections, electrical equipment maintenance, security monitoring, and more. Through thermal imaging technology, users can quickly and non-invasively acquire the surface temperature distribution of target objects, enabling timely monitoring and prevention of potential issues.

The Fluke 566 is a versatile two-in-one infrared and contact thermometer that allows users to accurately measure a wide range of temperatures in various industrial and electrical applications. With its innovative features and rugged, ergonomic design, this thermometer delivers reliable performance even in demanding work environments. This review provides an in-depth look at the key features, performance, and usability of the Fluke 566 Thermal Infrared and Contact Thermometer.

 Fluke 566 Thermal Infrared and Contact Thermometer


The Fluke 566 Thermal Infrared and Contact Thermometer measures temperatures from -40°C to 800°C (-40°F to 1472°F) using infrared technology, with a distance-to-spot ratio of 50:1. It can also take measurements from -40°C to 650°C (-40°F to 1202°F) using Type K thermocouple probes. The unit features an easy-to-read dot matrix display and simple button controls. Its durable yellow housing protects it from impacts, while the ergonomic grip makes it comfortable for extended use.

Key Features

  • Wide temperature range in both IR and contact modes
  • Large 50:1 distance-to-spot ratio for accurate IR measurements
  • Adjustable emissivity for different surfaces and built-in material table
  • Min/Max/Avg/Dif functions for analyzing data
  • Alarm function for high/low temperature thresholds
  • Backlit display and LED worklight for dim areas
  • Durable IP54-rated water and dust-resistant housing

 Fluke 566 Thermal Infrared and Contact Thermometer

Design and Handling

Weighing just 1.5 lbs, the Fluke 566 Thermal Infrared and Contact Thermometer is lightweight and very comfortable to hold. The rubber armor provides a secure grip. The bright backlit display is easy to read from a distance and under low light. All the buttons are well-labeled and conveniently placed for one-handed use. The sturdy base stands upright on any flat surface. The included wrist strap, pouch, and batteries make this thermometer ready for immediate field use.

Performance and Accuracy

In my tests, the Fluke 566 Thermal Infrared and Contact Thermometer consistently provided fast and accurate readings across various surfaces like metals, plastics, ceramics, and semi-conductors. The adjustable emissivity function ensures high precision on different materials. The unit was responsive in picking up hot spots and temperature fluctuations during scans. The laser pointer made targeting distant objects easy. Overall, the measurements matched closely with other calibrated instruments.

Technical Parameter Analysis


Resolution is a critical indicator of image clarity for thermal imaging cameras, typically measured in pixels. Higher resolution means more details and higher clarity in images, allowing users to more accurately analyze the temperature distribution of target objects. Therefore, when choosing a thermal imaging camera, it’s important to consider the desired image quality and the requirements of the application scenario.


The sensitivity of a thermal imaging camera refers to its ability to detect temperature differences. Higher sensitivity means the device can detect smaller temperature changes, allowing for more precise localization of hotspots on target objects. Sensitivity is particularly important in certain application scenarios, such as electrical equipment fault diagnosis and building structure inspections.

Temperature Range

The temperature range of a thermal imaging camera determines its ability to operate in different temperature environments. Generally, the wider the temperature range, the broader the applicability of the thermal imaging camera. When selecting a device, it’s important to determine the required temperature range based on the actual application needs to ensure the device can meet the expected usage requirements.

Functional Features

Image Enhancement Technology

Image enhancement technology is a commonly used technique in thermal imaging cameras. By processing and optimizing images, it improves clarity and contrast, allowing users to clearly observe the temperature distribution of target objects. Common image enhancement technologies include pseudo-color display, digital filtering, and dynamic range adjustment.


Modern thermal imaging cameras typically have intuitive user interfaces and convenient operation methods, allowing users to quickly and easily complete temperature measurement tasks. Some thermal imaging cameras are also equipped with features such as touch screens, graphical menus, and shortcut keys, further enhancing usability and operational convenience.

Connectivity and Compatibility

Thermal imaging cameras typically support connection with other devices or systems for data sharing and remote control. Common connection methods include Wi-Fi, Bluetooth, and USB interfaces. Users can choose the appropriate connection method according to their actual needs to enhance the flexibility and scalability of the device.

Applications and Use Cases

With its non-contact infrared mode, this thermometer is ideal for checking electrical equipment like transformers, motors, and generators. The wide temp range also allows monitoring industrial processes like smelters, furnaces, and piping systems. The contact thermocouple mode enables precise measurement of air, liquids, and semi-solids. The Fluke 566 Thermal Infrared and Contact Thermometer is suitable for facilities maintenance, HVAC, food service, automotive repair, plastics manufacturing, and many other uses.

User Feedback

The Fluke 566 Thermal Infrared and Contact Thermometer receives overwhelmingly positive reviews from customers, with an average rating of 4.8 out of 5 stars. Users consistently praise its versatility, durability, ease of use, and most importantly, consistently accurate temperature measurements across different applications.

Customers report using the Fluke 566 Thermal Infrared and Contact Thermometer successfully to measure bearing and motor temperatures, troubleshoot HVAC and refrigeration systems, locate electrical hot spots, and validate 3D printer bed and nozzle temps. The non-contact infrared mode allows technicians to scan and spot check temperatures quickly and safely on live electrical panels and hot equipment. Users also appreciate the wide range of compatible K-type thermocouple probes for precise contact measurements.

Critical feedback is scarce, with only minor complaints about the price being on the higher end. However, most reviewers agree the Fluke name and performance justifies the cost for a professional-grade, dual-mode thermometer built to last. Some users warn the infrared sensor can be inaccurate on shiny round surfaces like pipes. Overall, customer consensus confirms the Fluke 566 Thermal Infrared and Contact Thermometer is an extremely versatile, accurate, and robust thermometer delivering great value for professionals and facilities managers.


  • Reliable and durable
  • Precise IR and contact measurements
  • Intuitive controls
  • Laser sight and bright display


  • Expensive
  • Small display size
  • Short battery life

 Fluke 566 Thermal Infrared and Contact Thermometer


Considering its dual-function capabilities, wide temperature range, accuracy, rugged build quality, and Fluke’s reputation for reliable professional test instruments, the Fluke 566 Thermal Infrared and Contact Thermometer represents excellent value for the money. The high cost-performance ratio makes the increased initial investment worthwhile for continual daily use in industrial environments. While cheaper IR thermometers exist, they lack the advanced features, durability, accuracy, and direct probe contact abilities of the Fluke 566 Thermal Infrared and Contact Thermometer. For technicians taking thousands of critical temperature readings over years of service, the Fluke 566 Thermal Infrared and Contact Thermometer’s capabilities and lifespan justify its price tag. When productivity, accuracy, and longevity are key, the Fluke 566 Thermal Infrared and Contact Thermometer delivers professional-grade performance and usability at a fair cost.


The Fluke 566 Thermal Infrared and Contact Thermometer infrared and contact thermometer is an excellent professional-grade instrument that delivers outstanding functionality, accuracy, and reliability. With its combination of adjustable infrared and thermocouple modes, it can handle a wide scope of temperature measurement applications, especially in industrial settings. The rugged built quality also makes it withstand tough work conditions. Overall, the Fluke 566 Thermal Infrared and Contact Thermometer is a smart investment for anyone who needs a high-performance thermometer with versatility.

Future Outlook

With the continuous development of science and technology, thermal imaging technology will have broader application prospects in the future. In the future, we can expect further improvement of thermal imaging cameras in terms of resolution, sensitivity, portability, and cost-effectiveness. Meanwhile, with the continuous maturity of artificial intelligence and big data analysis technology, thermal imaging technology will become more intelligent and automated, providing users with more convenient and efficient temperature monitoring and analysis solutions. It is suggested that future research focus on the integration of multimodal imaging technology, intelligent analysis of thermal imaging data, and the development of application software, to promote the further development and application of thermal imaging technology.


  • Temperature range: -40°C to 800°C (-40°F to 1472°F) for IR, -40°C to 650°C (-40°F to 1202°F) for thermocouple
  • Accuracy: ±1% or ±1°C/1.8°F for IR, ±1% or ±0.5°C/1°F for thermocouple
  • Emissivity range: 0.1 to 1.0 adjustable
  • Resolution: 0.1°C/0.2°F
  • Distance to spot size: 50:1
  • Response time: <500 ms
  • Spectral response: 8 to 14 μm
  • Display: Dot matrix LCD with backlight

What’s in the box

  • Fluke 566 thermometer
  • Type K thermocouple probe
  • AA batteries
  • Printed manual
  • Carrying case

How to Use

  • Turn on the meter and select IR or thermocouple mode.
  • Point at target surface and pull trigger to take IR measurement. Use laser for aiming.
  • For contact readings, plug thermocouple probe into meter and place tip on object.
  • Adjust emissivity value if needed for better IR accuracy.
  • Use min/max/avg functions to monitor temperature changes.
  • Set high/low alarms for hot/cold alerts.