← All units
Calculated from the sensor's pixel pitch and the lens focal length, for clear air. 
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
Guide 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
GuideHandheld monocular · 640-class · Laser rangefinder
Guide TD633 LRF
- Approx. price
- ~$1,799
- Sensor
- 640×512 · 12 µm
- Lens
- 35 mm · 2×
- Weight
- 13.3 oz
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Best for
Walk-and-scan glassing from a jacket pocket
01Specifications
As published by Guide. Sources: guideir-thermal.com, guideoutdoor.com.
- Sensor
- 640×512
- Pixel pitch
- 12 µm
- NETD
- 20 mK
- Refresh rate
- 50 Hz
- Lens
- 35 mm
- Digital zoom
- up to 16×
- Field of view
- 12.5° horizontal
- Display
- 1280x960 AMOLED
- Claimed detection
- 1,800 m
- Claim basis
- unspecified
- Run time
- 10 h
- Battery type
- 18650
- Weight
- 13.3 oz
- Length
- 6.3″
- Records video
- Yes
- Wi-Fi
- Yes
- IP rating
- IP67
- Warranty
- 5 years (10 years on sensor)
- Approx. price
- ~$1,799
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 (104th-best of 285 that publish it)
- Built-in laser rangefinder
- Takes 18650 batteries you can swap in the field
- 10 h of battery, 33rd-longest of 344 here
- Waterproof (IP67), survives a dunking
- Records video and connects to a phone app
Against it
- Rangefinder but no ballistic calculator, so holdover is up to you
- Zoom past 2× is digital and gets blurry
03Compare the LRF
04Related units
GuideHandheld monocular
Guide Kodiak TK635 LRF 3.0
Est. detection
729 m
Maker’s claim
1,800 m
- Sensor
- 640×512
- Pitch · Hz
- 12 µm · 50
- Lens
- 35 mm
LRF · Swappable battery · 18.5 oz~$2,499
GuideHandheld monocular
Guide Kodiak TK650 LRF 3.0
Est. detection
1,042 m
Maker’s claim
2,600 m
- Sensor
- 640×512
- Pitch · Hz
- 12 µm · 50
- Lens
- 50 mm
LRF · Swappable battery · 20.9 oz~$2,899
GuideHandheld monocular
Guide TD653 LRF
Est. detection
1,042 m
Maker’s claim
2,600 m
- Sensor
- 640×512
- Pitch · Hz
- 12 µm · 50
- Lens
- 50 mm
LRF · 16.6 oz~$1,899