ATN OTS-HD 640 2.5-25x product image

ATN OTS-HD 640 2.5-25x

The OTS-HD 640 2.5-25X is a thermal monocular made by ATN and is part of the OTS-HD series.

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The OTS-HD 640 2.5-25x features a crisp 50mm objective lens focusing the available thermal radiation. The field of view on this thermal monocular is 12.5 by 9.7 degrees. It features a 25 times digital zoom to enlarge your subject. The eye relief distance is measured at 65mm.

Behind the lens of the OTS-HD 640 2.5-25x you can find the (uncooled) 640 x 480 pixels thermal core refreshing the image at 30Hz.

The physical dimensions of this thermal monocular read 224 x 80 x 80mm (lwh) weighing in at 840 grams. It handles dust, shocks and water (splashes).

The OTS-HD 640 2.5-25x is built to be used in scanning and surveillance, police operations and search and rescue.


  • WiFi
  • Gyroscope
  • Magnetometer
  • Accelerometer
  • Smooth Zoom
  • E-Compass
  • GPS Geotag
Lens50 mm
Eye relief distance65 mm
Optical zoom2.5 x
Digital zoom25 x
FOV (h/v)12.5 ° / 9.7 °
Thermal typeUncooled
Sensor resolution (h/v)640 pixels / 480 pixels
Display resolution (h/v)800 pixels / 600 pixels
Refresh rate30 Hz
Output screen colorFull color
Dimensions (l/w/h)224 mm / 80 mm / 80 mm
Weight840 g
TypeAA 1.5 V
Number of batteries4
Battery life8 hours
Law enforcement
Search & rescue
Fire fighting


Part of OTS-HD series