Guide IR TU420 product image

Guide IR TU420

The TU420 is a thermal weapon sight made by Guide IR and is part of the TU series.


The TU420 uses a quality 25mm f/1.1 lens to capture thermal radiation. The field of view (FOV) on this thermal weapon sight reads 15.49 x 11.65 degrees. It's equipped with a 4x digital zoom to capture additional details. The exit pupil diameter is 48mm.

Inside the housing of the TU420 you'll find the (uncooled, 17µm) 400 by 300px thermal imaging sensor with a refresh rate of 50Hz. The NETD (Noise Equivalent Temperature Difference) of this thermal weapon sight is <30mK and it's operating between the 8µm and 14µm wavelengths.

The dimensions of this thermal weapon sight are 367 x 107 x 69mm (length/width/height) and weighs in at 930g. This device is rated IP67. It can withstand dust, shocks, water (splashes) and submersion under water. Operating temperatures range between -30°C and 50°C.

The TU420 is suitable for hunting and law enforcement.



  • High Contrast OLED display
  • Smooth Zoom
  • Six color palettes
  • Live Video Streaming
  • Ultra Long Battery Life
  • IP67 Rated


Lens25 mm
Diopter adjustment-4 +4
Exit pupil diameter48 mm
Optical zoom1.6 x
Digital zoom4 x
FOV (h/v)15.49 ° / 11.65 °
Thermal typeUncooled
Sensor resolution (h/v)400 pixels / 300 pixels
Pixel pitch17 µm
Sensitivity30 mK
Spectral range8 µm / 14 µm
Display resolution (h/v)1024 pixels / 768 pixels
Refresh rate50 Hz
Image polarityWhite Hot, Black Hot, adjustable Red Hot , Green Hot, Iron Red, Blue Hot
Output screen colorFull color
Startup time18 seconds
Reticle details10 variations in 6 colors
Rail detailsStandard 30 mm Scope Rings
Package contentsUSB Type-C cable, Lens cap, 5V2A adapter, Customized battery, Customized battery charger, Micro HDMI cable, Eye mask, Picatinny rail clips (x2) , Quick start guide
Dimensions (l/w/h)367 mm / 107 mm / 69 mm
Weight930 g
Number of batteries1
Battery life5 hours
Operating temperature-30 °C / 50 °C
Storage temperature-45 °C / 70 °C
Environmental ratingIP67
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 264 meters 66 meters 33 meters
Person 931 meters 232 meters 116 meters
Vehicle 2254 meters 563 meters 281 meters

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

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