Trijicon IR-PATROL IRMO-250
The Trijicon IR-PATROL IRMO-250 is a 640×480, 12 µm thermal handheld monocular behind a 19 mm lens. On the Johnson yardstick that is an estimated 396 m detection and 99 m recognition range for a standing person; Trijicon publishes no detection figure. It is the dearest of the 19 handhelds here, at ~$6,895.
- Approx. price
- ~$6,895
- Sensor
- 640×480 · 12 µm
- Lens
- 19 mm · 1×
- Est. detection
- 396 m · 433 yd
Scanning from a stand, a truck or a field edge
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Box claim vs. what the optics support
One pixel of this unit sees 0.632 mrad (12 µm ÷ 19 mm). Two pixels across a 0.5 m human is 0.5 ÷ (2 × 0.632) × 1000 = 396 m. The box figure is usually computed against a person’s 1.8 m height instead, which is why it comes out higher. Full explanation.
Specifications
Manufacturer-published figures, cross-checked against trijicon.com (19mm 60 Hz IR-PATROL; IRMO-100 at $6,047 is the 30 Hz variant), trijicon.com warranty page.
- Sensor
- 640×480
- Pixel pitch
- 12 µm
- Refresh rate
- 60 Hz
- Lens
- 19 mm
- Digital zoom
- up to 8×
- Field of view
- 22° horizontal
- Run time
- 2 h
- Battery type
- CR123
- Weight
- 16 oz
- Length
- 6″
- Records video
- No
- Wi-Fi
- No
- Warranty
- 3 years (electronics; lifetime optics/housing)
- Approx. price
- ~$6,895
Derived here
Estimated from pixel pitch and lens focal length using the Johnson criteria (2, 8 and 13 pixels across a 0.5 m human critical dimension), clear air, 50 % probability. A model of the optics, not a measurement — real range depends on temperature contrast, humidity and the animal.
- IFOV
- 0.632 mrad
- Est. detection
- 396 m
- Est. recognition
- 99 m
Features
- 640 sensor
- 12 µm
- 19 mm lens
- 60 Hz
- Removable battery
- Under 20 oz
What the spec sheet says
Read from the published specifications and this catalog’s own numbers — not from owner reports, which we have not collected for this unit.
- 640×480 core — 2.8× the pixels of a 384-class unit
- 12 µm pitch — the 19 mm lens sees what a 17 µm core would need 27 mm to match
- 60 Hz core — 20 % more frames than the 50 Hz norm when an animal runs
- Runs on CR123 cells you can swap in the field
- Wide 22.9° field for scanning
- NETD not published — sensitivity cannot be compared on paper
- No detection range published by the maker
- Only 2 h published run time
- Does not record video
- No IP rating published
- Estimated recognition only 99 m — inside typical shooting distance
Compare the IRMO-250
Related units
Armasight Sidekick 640
- Sensor · lens
- 640×480 · 19 mm
- Pitch · refresh
- 12 µm · 60 Hz
- Est. detection
- 396 m
- Box claim
- 709 m
ATN BlazeHunter 635 LRF
- Sensor · lens
- 640×512 · 35 mm
- Pitch · refresh
- 12 µm · 50 Hz
- Est. detection
- 729 m
- Box claim
- 1,830 m
Pulsar Axion 2 LRF XG35
- Sensor · lens
- 640×480 · 35 mm
- Pitch · refresh
- 12 µm · 50 Hz
- Est. detection
- 729 m
- Box claim
- 1,750 m