Guide IR IR518-A product image

Guide IR IR518-A

The IR518-A is a thermal monocular made by Guide IR and is part of the 518 series.


The IR518-A spots a crisp 25mm f/1 objective lens collecting thermal radiation. The default field of view on this thermal monocular is 9.2 by 6.9 degrees. It has a 2 times digital zoom to enlarge (parts of) the image.

Behind the lens of the IR518-A you can find the (uncooled, 25 micrometer) 160 x 120 pixels core refreshing the image at 50Hz. It's operating within the 8µm to 14µm infrared spectrum.

The physical dimensions of this thermal monocular read 169 x 69 x 107mm (lwh) and the scale reads 760 grams. This device is rated IP66. It handles dust, shocks and water (splashes). It's rated for operating in temperatures between -20°C and 50°C.

The IR518-A can be used in scanning and surveillance, hunting adventures and police operations.



  • Light weight and compact design
  • Day & night easy operation
  • Image capture, mission reporting
  • Waterproof and shockproof
  • License free & rapid delivery


Lens25 mm
Optical zoom1.0 x
Digital zoom2.0 x
FOV (h/v)9.2 ° / 6.9 °
Thermal typeUncooled
Sensor resolution (h/v)160 pixels / 120 pixels
Pixel pitch25 µm
Spectral range8.0 µm / 14.0 µm
Display resolution (h/v)320 pixels / 240 pixels
Refresh rate50.0 Hz
Image polarityWhite Hot, Black Hot
Output screen colorFull color
Startup time4 seconds
Package contentsCarry Case, Test Report, Software CD, Monitor Cable/USB/RS232/Mains Breakout, Mains Adaptor, Neck Strap, Lens Cloth & Handstrap
Dimensions (l/w/h)169 mm / 69 mm / 107 mm
Weight760 g
Number of batteries4
Battery life2 hours
Law enforcement
Search & rescue
Fire fighting
Operating temperature-20.0 °C / 50.0 °C
Storage temperature-40.0 °C / 60.0 °C
Environmental ratingIP66

DRI Ranges

DRI stands for Detection, Recognition and Identification and is based on the widely used Johnson's criteria.

  • Detection Detect if an object is present
  • Recognition See what type of object it is (i.e. person, vehicle, airplane)
  • Identification For example see if someone is a friend or foe
Detection Recognition Identification
Rabbit 180 meters 45 meters 22 meters
Person 633 meters 158 meters 79 meters
Vehicle 1533 meters 383 meters 191 meters

Please note that these values are calculated, always consult the manufacturer for official range numbers.


Guide IR 518 series
Guide IR 518 series
Package contents of Guide IR518 series
IR518 series dimensions reference
Rooftop video of Guide IR518-C
Spotting a fox at 150 yards using the Guide IR518-C
Kangaroo boxing! Filmed with a Guide IR 518-C thermal monocular

More in 518 series