Guide IR TN650 product image

Guide IR TN650

The TN650 is a thermal bi-ocular made by Guide IR and is part of the TN series.


The TN650 spots a crisp 50mm f/1.2 objective lens collecting thermal radiation. The default field of view on this thermal bi-ocular is 8.78 by 6.59 degrees. It has a 8 times digital zoom to enlarge (parts of) the image. The exit pupil diameter measures 16mm.

Behind the lens of the TN650 you can find the (uncooled, 12 micrometer) 640 x 480 pixels core refreshing the image at 50Hz. The thermal contrast (NETD) of this thermal bi-ocular is <30mK and it's operating within the 8µm to 14µm infrared spectrum.

The physical dimensions of this thermal bi-ocular read 162 x 146 x 70mm (lwh) and the scale reads 880 grams. This device is rated IP66. It handles dust, shocks and water (splashes). It's rated for operating in temperatures between -30°C and 50°C.

The TN650 can be used in scanning and surveillance, hunting adventures, police operations and search and rescue.



  • Ergonomic design
  • Integrated LRF (Laser Range Finder)
  • High Contrast OLED Display
  • PiP (Picture in Picture) mode
  • Smooth zoom
  • Six color palettes
  • WiFfi Streaming
  • IP66 Rating


Lens50 mm
Diopter adjustment-4 +2
Exit pupil diameter16 mm
Optical zoom2.8 x
Digital zoom8 x
FOV (h/v)8.78 ° / 6.59 °
Thermal typeUncooled
Sensor resolution (h/v)640 pixels / 480 pixels
Pixel pitch12 µm
Sensitivity30 mK
Spectral range8 µm / 14 µm
Display resolution (h/v)1024 pixels / 768 pixels
Refresh rate50 Hz
Image polarityBlack Hot, White Hot, Adjustable Red Hot, Iron Red, Blue Hot, Green Hot
Output screen colorFull color
Video formatsDigital out
Startup time2 seconds
Package contentsPower adapter, USB Type-C cable, Micro HDMI cable, Lens cap, Shoulder strap, Replaceable 18650 batteries (x2), Quick start guide
Dimensions (l/w/h)162 mm / 146 mm / 70 mm
Weight880 g
Number of batteries2
Battery life5.5 hours
Operating temperature-30 °C / 50 °C
Storage temperature-40 °C / 60 °C
Environmental ratingIP66
Law enforcement
Search & rescue
Fire fighting

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 750 meters 187 meters 93 meters
Person 2638 meters 659 meters 329 meters
Vehicle 6388 meters 1597 meters 798 meters

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

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