July 2026 - Written by the HeatSight Optics Team
HeatSight TPM O6 25LRF Review - The TPM O6 25LRF packs a full 640×512 sensor, a ≤30 mK NETD, and a 1,500-meter laser rangefinder into a one-pound, $899 unit. A 640-with-LRF thermal under $900 - with a 2.69-inch display - is a spec sheet that would have read like a misprint two years ago.
The O-series is our compact LRF platform: a 25 mm objective, a one-pound (500 g) body, and - unusually in this class - a big 2.69-inch 800×600 OLED display rather than a small eyepiece screen. Housing is IP66, impact-rated to 1000G, running -20°C to +60°C on a single 18650 (3,500 mAh) for 5+ hours.
The 640×512 core runs a ≤30 mK NETD - tighter than the ≤40 mK typical of this price class - on the standard 12 μm pitch. The 2.69" display changes how the unit is used: it's glanceable, shareable, and far easier on the eyes across a long night than pressing your face to an ocular.
Full 1,500-meter ranging with ±1 m near-field accuracy, on a unit this size and price. Zoom steps at 1×/2×/4×. Six palettes, PiP, hotspot tracking, four menu languages, 16 GB recording, USB-C charge and export.
The O6 does everything I ask of a scanner and then tells me the distance. The 640 core in a handheld this size finds heat fast across a wide view, and the ranging button turns every observation into usable information: not just a deer, a deer at 240. Cold nights knock the batteries down as physics demands, so I rotate warm spares from an inside pocket. It has made my rifle scope better by making me pickier about which heat is worth a stalk.
1,500 m LRF in a one-pound package: The most portable ranging thermal we make.
30 mK NETD: Better thermal sensitivity than most competitors at the price.
640 resolution + LRF under $900: The strongest resolution-per-dollar package in our catalog.
Common 18650 power: One cheap, ubiquitous cell; 5+ hour runtime.
The O6 is the sleeper of our lineup: the O3's package with four times the pixels. If it's between the two and the budget allows, buy the O6 - sensor resolution is the one spec you can't upgrade later. 2-Year Limited Warranty.
Specifications: 640×512 VOx, 12μm, NETD ≤30mK | 25mm, 10.5°×7.9° | LRF 10-1,500m | OLED 800×600, 2.69" | ≤50Hz | 6 palettes, PiP, hot tracking | 16GB, JPG/MP4, USB | 18650 3,500mAh, ≥5h | -20°C~+60°C | 1000G | IP66 | 196.5×96×66mm | 500g
The HeatSight Optics TPM O6 25LRF is available at heatsightoptics.com for $899 (regularly $1,499). It's in stock and ships from our Michigan facility. Questions about which HeatSight scope fits your hunting or property-security setup? Call us at (313) 338-8168 - you'll talk to the people who actually build and flash these units, not a call center.
This review was written by the HeatSight Optics team based on our own design, bench, and field testing of production units. We build these scopes, so consider the source - and consider that we also publish the cons, because we'd rather you buy the right scope than return the wrong one.