AGM ObservIR LRF 35-640 — 640×512 thermal binocular

How far you can see a person

112 m make out detail182 m tell what it is729 m spot it┆ maker’s claim

501002005001k2k5k m

Calculated from the sensor's pixel pitch and the lens focal length, for clear air.

AGM Global Vision quotes 1,800 m, 2.5× our figure, because makers usually measure against a person’s full height rather than their width. Why the numbers differ

AGM Global VisionBinocular · 640-class · Laser rangefinder

AGM ObservIR LRF 35-640

Approx. price: ~$3,295
Sensor: 640×512 · 12 µm
Lens: 35 mm · 3×
Weight: 32.1 oz

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Best for

Long sits over open ground, glassed with both eyes

01Specifications

As published by AGM Global Vision. Sources: agmglobalvision.com (product page, 2026 catalog), downloads.agmglobalvision.com (datasheet).

Sensor: 640×512
Pixel pitch: 12 µm
NETD: <15 mK
Refresh rate: 50 Hz
Lens: 35 mm
Base magnification: 3×
Digital zoom: up to 22×
Field of view: 12.5° horizontal
Display: 1920x1080 OLED
Claimed detection: 1,800 m
Claim basis: 6 ft (1.8 m) object
Run time: 8 h
Battery type: 18650
Weight: 32.1 oz
Length: 8.7″
Laser rangefinder: Yes
Ballistic calculator: No
Records video: Yes
Wi-Fi: Yes
IP rating: IP67
Warranty: 5 years
Approx. price: ~$3,295

02Pros and cons

From the published specs, not owner reports.

For it

640×512 sensor, 3× the detail of an entry-level 384
Sensitive sensor that picks out small heat differences on humid or rainy nights (the best of 285 that publish it)
Built-in laser rangefinder
Takes 18650 batteries you can swap in the field
8 h of battery
Waterproof (IP67), survives a dunking
Records video and connects to a phone app

Against it