• Full-featured multimeter with built-in thermal image
  • 15 measurement functions including: AC voltage with low-pass filter; DC voltage; Resistance; Continuity; Capacitance; Diode test;
  • Low-pass filter for troubleshooting adjustable speed drives


Fluke 279 FC True-rms Thermal Multimeter helps you find, repair, validate, and report many electrical issues quickly so that you are confident problems are solved.

Locate the problem immediately
Thermal imaging multimeters are a first-line troubleshooting tool for electrical equipment that can check hot spots on high-voltage equipment and transformers, and detect heating of fuses, wires, insulators, connectors, splices and switches. Scanning with the 279 FC’s thermal imager reveals many electrical issues rapidly and from a safe distance. By combining two tools into one, the thermal multimeter lightens the load and increases productivity.

Expanded functionality
Compatible with iFlex® (a flexible current clamp) to expand your measurement capabilities and get into tight, hard to reach spaces for current measurement (up to 2500 A AC). The large full-color LCD screen makes for easier and clearer viewing of images and readings. The 10 hour+ rechargeable battery keeps you going all day long under normal conditions.

Communicate your results
With built-in Fluke Connect®, transmit results wirelessly to a smartphone and save time on reporting to validate work is complete. Troubleshoot better by instantly trending and monitoring measurements live on your smartphone screen. Create and email reports right from the field.


  • Full-featured multimeter with built-in thermal imager
  • 15 measurement functions including: voltage ac and dc, resistance, continuity, capacitance, diode test, Min/Max/Avg, current ac with included iFlex current probe, frequency
  • Low-pass filter for troubleshooting adjustable speed drives
  • Thermal imaging reveals hots spots that may indicate electrical issues quickly and safely
  • Two-in-one tool is designed to increase productivity – no need to go back to the truck or office to retrieve a shared camera – so you can do more in less time!
  • iFlex expands your measurement capabilities – get into tight, hard to reach spaces for current measurement (up to 2500 A ac)
  • Save measurements and images while communicating wirelessly with a smart phone up to 20 feet / 6.1 m away (no obstructions)
  • 102×77 image resolution offers immediate visual cues of hot, potentially troublesome areas
  • 3.5 in /8.89 cm color LCD screen
  • Rechargeable lithium ion battery allows for a for a full work day (10+ hours) under normal conditions; a second battery option means you will always have a battery ready to install.
  • Assembled in the USA
  • Three year standard warranty
  • Auto power off to save battery power
  • CAT III 1000 V, CAT IV 600 V measurement category
  • Designed for durability, built to withstand a 1 m (3 ft) drop, double insulated with raised rubber holster for increased protection
  • DMM
    Basic dc accuracy 0.09%
    Bandwidth 1% 45 Hz to 65 Hz, full time low pass filter
    Voltage ac/dc 1000 V
    Current ac 2500 A with included iFlex Flexible Current Probe
    Resistance 50 MΩ
    Frequency 100 kHz
    Capacitance 9,999 µF
    Continuity with beeper Yes
    Diode test Yes
    Min/Max recording Yes
    Display Hold Yes


    Infrared camera
    Infrared resolution 102 x 77
    Image capture frequency 8 Hz
    Field of View 36° (w) x 27° (h)
    NETD ≤200 mK
    Infrared spectral band 7.5 to 14 microns
    Center point Yes (with center point temp)
    Focus mechanism Fixed focus
    Temperature Range (selectable °C and °F) -10 °C to 200 °C (14 °F to 392 °F) Accuracy: ±5 °C (9 °F) or (±5% as tested)
    Emissivity 0.95 fixed
    Background compensation 20 °C fixed
    Memory storage Approximately 100 images (internal)
    File format Non-radiometric .is2


    General specifications
    Battery type Rechargeable lithium ion battery (charge time: 4.5 hours)
    Operating temperature -10 °C to 50 °C (14 °F to 122 °F)
    Storage temperature -20 ºC to 60 ºC (-4 °F to 140 °F)
    Relative humidity 0% to 90% (0 °C to 35 °C) (32 °F to 95 °F)
    0% to 75% (35 °C to 40 °C) (95 °F to 104 °F)
    0% to 45% (40 °C to 50 °C) (104 °F to 122 °F)
    Altitude 2,000 meters (6,561 feet)
    Temperature coefficient Add 0.1 x specified accuracy for each °C above 28 °C or below 18 °C (°F above 82 °F or below 64° F)
    Ingress Protection (IP) IP40 (non-operating)
    Wireless frequency 2.4 GHz ISM Band, 20 meter range
    Certifications CE, CSA, FCC
    Safety compliance IEC 61010-1: Pollution degree 2; IEC 61010-2-033: CAT III 1000 V/CAT IV 600 V
    EMC EN 61326-1:2012
    Size 215.9 x 93.9 x 57.1 mm (8.5 x 3.7 x 2.25 in)
    Weight 0.793 kg (1.75 lb)
    Warranty Limited three-year warranty


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