InfiRay Finder FH25 product image

InfiRay Finder FH25

The FINDER FH25 is a thermal monocular made by InfiRay and is part of the Finder series.


The Finder FH25 uses a quality 25mm lens to capture thermal radiation. The field of view (FOV) on this thermal monocular reads 17.5 x 14 degrees. It's equipped with a 6x digital zoom to capture additional details. The exit pupil diameter is 20mm.

Inside the housing of the Finder FH25 you'll find the (uncooled, 12µm) 640 by 512px sensor with a refresh rate of 50Hz.

The dimensions of this thermal monocular are 70 x 52 x 130mm (length/width/height) and weighs in at 320g. It can withstand dust, shocks and water (splashes).

The Finder FH25 can be used for surveillance missions, hunting, law enforcement and search and rescue operations.


  • 12 µm pixel pitch
  • Long Range Detection
  • 50Hz realtime video
  • Laser Rangefinder (LRF)
  • Record photo & video
  • WiFi connectivity
  • Accelerometer and E-Compass


Lens25 mm
Diopter adjustment-4 +5
Exit pupil diameter20 mm
Optical zoom1.5 x
Digital zoom6 x
FOV (h/v)17.5 ° / 14 °
Thermal typeUncooled
Sensor resolution (h/v)640 pixels / 512 pixels
Pixel pitch12 µm
Display resolution (h/v)1280 pixels / 960 pixels
Refresh rate50 Hz
Output screen colorFull color
Additional detailsThis version doesn't include a LRF
Dimensions (l/w/h)70 mm / 52 mm / 130 mm
Weight320 g
Number of batteries1
Battery life8 hours
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 375 meters 93 meters 46 meters
Person 1319 meters 329 meters 164 meters
Vehicle 3194 meters 798 meters 399 meters

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


InfiRay Finder Series
InfiRay Finder Series
InfiRay Finder Series
InfiRay Finder Series
InfiRay Finder Series

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