July 2026 - Written by the HeatSight Optics Team
HeatSight TPM C19-640 35mm LRF Review - The C19-640 35mm LRF takes our most popular 640 configuration and adds a 1,500-meter laser rangefinder for $200 over the base model - the cheapest path to a ranging-equipped 640 thermal that we know of, ours or anyone's.
A compact tube-style thermal at 700 g with a 35 mm manual-focus germanium objective and 2x base magnification, expanding to 2-8x with electronic zoom. Dimensions are 196.5 × 96 × 66 mm. It mounts like a day optic and disappears on the rifle compared to the 3-pound LRF flagships from the big brands.
Every C19 shares the same 640×512 VOx core: 12 μm pixel pitch, ≤40 mK NETD, ≤50 Hz refresh, 8-14 μm band, manual focus, and a sharp 1440×1080 OLED display - a meaningful resolution step over the 1024×768 eyepieces common at this tier. Six palettes (White Hot, Black Hot, Fire Hot, Rainbow, Iron Red, Cold Color), picture-in-picture, hotspot tracking, and five menu languages are standard. Recording is onboard: 16 GB storage (13.8 GB usable), JPG/MP4, USB charge and export.
Power is a pair of removable 18350 cells (1,400 mAh each) rated for 5+ hours at ≤1.8 W. 18350s keep the scope compact, but they're less common at the corner store than 18650s - buy two spare pairs with the scope and rotate them. The housing is IP66 and rated to 1000G of recoil, operating -20°C to +60°C.
The built-in LRF ranges 10 m to 1,500 m with ±1 m accuracy inside 400 m (±0.4% beyond). On a thermal, where depth perception is nil, a one-button range reading is the difference between a confident hold and a guess - especially on coyote-sized targets past 150 yards.
I run the ranging against distances I already know: markers at my range, fence posts I have walked off, the corner of a far outbuilding. It agrees with the tape inside a couple meters, every press, fast enough that the number is there before I have settled the crosshair. Trust in an LRF is binary, either you believe the number or you do not, and this one has given me no reason for doubt.
In the field this configuration is the do-everything setup: 640 image quality for finding and judging animals, 35mm width for scanning on the move, ranging for the moment it matters. Detection on hog and coyote heat comes far beyond honest shooting distance, and the image holds enough detail at zoom to make the call. If someone can only buy one HeatSight scope and wants ranging, this is the answer I give.
Full 640×512 sensor at this price: Most competitors at this money are selling 384 cores.
1440×1080 OLED display: Sharper eyepiece image than the 1024×768 norm in this class.
1,500 m LRF for a $200 premium: The lowest-cost route to on-scope ranging with a 640 sensor.
Compact and light: 700 g on the rifle, standard mounting.
If you hunt anywhere that a 200+ yard shot can present itself, the LRF pays for itself the first time it stops you from holding wrong. This is the configuration we'd put on a do-everything predator rifle. 2-Year Limited Warranty, as with every HeatSight scope.
Specifications: 640×512 VOx, 12μm, NETD ≤40mK | 35mm, 12.5° × 10.0° | 2x base, 1-8x e-zoom | LRF 10-1,500m, ±1m <400m | OLED 1440×1080, 0.39" | ≤50Hz | 6 palettes, PiP, hot tracking | 16GB, JPG/MP4, USB | 2×18350 1,400mAh, ≥5h | -20°C~+60°C | 1000G | IP66 | 196.5 × 96 × 66 mm | 700g
The HeatSight Optics TPM C19-640 35mm LRF is available at heatsightoptics.com for $1,399 (regularly $1,599). 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.