Detector type: Hand select, high sensitivity Uncooled Focal Plane Array – USA
Refresh rate: 60 Hz
Resolution: Hand select 640 x 512 sensors with ultra sensitive, crisp imagery with TTM (Target Temperature Measurement)
FOV: 14.8 ° × 11.8° (H x V)


  • Two Lithium CR123A batteries
  • Loaded kit, All standard accessories, cables, user manual.
  • Remote Control


Product shown herein is subject to US export regulations and may require a license prior to export. Any diversion contrary to US Government regulations is prohibited.



Detector Type: Hand select, high sensitivity Uncooled Focal Plane Array – USA
Refresh Rate: 60 Hz
Resolution: Hand select 640 x 512 sensors with ultra-sensitive, crisp imagery with TTM (Target Temperature Measurement)
Field of View (FOV): 14.8 ° × 11.8° (H x V)​

Performance and Usage

Quick conversion of daytime optics into thermal imaging scope.
Long-range clip-on thermal scope.
Real-time numeric temperature measurement with bar and graph.
Outstanding sensitivity and image quality.
Rock steady accurate precision LWIR sight.
Used in day, twilight, and at night.
Fully sealed, hardened, rugged all-weather platform.
Crisp clear color OLED micro display with high clarity Quartz glass.
Outstanding sensitivity and image quality.

Technical Specifications::

Lens system: 50 mm; F/1.
Optical magnification: Variable.
Digital zoom: 1×, 2×, 4×, and 8×.
Diopter adjustment range: -5 to +5 dpt.
Focusing range: 5 m to infinity.
Eye relief: 60 mm.

Display and Power:

Display: 1280×1024 OLED / Quartz.
Video output: PAL (768×574 pixels)/ NTSC (640×480 pixels).
Battery Type: Two CR123.
Battery Life (Operating): 5 hr.
External power supply: External battery pack via micro-USB port.
Power supply: 3.6~7.2V.

Physical Attributes

Operating Temperature Range: -25°C to +55°C.
Storage Temperature Range: -40°C to +70°C.
Exit Pupil Diameter: 25mm.
Environment Rating: Waterproof.
Remote control: Wireless.
Weight: 0.7 kg (1.5lbs).
Overall Dimensions: 208 x 71 x 81 mm (8.2 x 2.7 x 3.1 in).


The SPI Dauber is a compact, all weather Ultra high performance, high sensitivity thermal IR imaging clip-on sniper sight that allows quick transformation of the day optics into thermal imaging device without any special skills. The system has real time TTM Target Temperature Measurement with multiple user modes for hunting, facial ID, snipe, Close Quarter and other environmental Target acquisitions settings which assist in discerning select targets of interest. The Dauber utilizes the best hand select LWIR FPA sensors coupled with rugged, hardened, coated Germanium optics. The Dauber can withstand serious recoil offering rock steady zero & can be easily attached in-line onto your dayscopes for Medium to long range use in day, dusk or in total darkness at night. Powered with two CR123 batteries the unit provides up to 5 hours of continuous work. An optional external battery pack (5V) with high-capacity is capable of increasing the total operation time to up to 44 hours. The Dauber can be also connected to an optional video recorder for shooting real time video or external Wi-Fi module for conjunction with smartphones.

  • Long range clip on thermal scope
  • Real time numeric temperature measurement with bar and graph
  • Outstanding sensitivity and image quality
  • Rock steady accurate precision LWIR sight
  • Used in day, twilight and at night
  • Fully sealed, hardened, rugged all weather platform
  • Crisp clear color OLED micro display with high clarity Quartz glass
  • Mounts in front of any daytime scope, no re-zeroing is required
  • Hand select ultra sensitive 17μm pitch thermal sensor
  • Lightweight and robust design
  • System can be used with binoculars, spotting scopes or monoculars.
  • Multiple situational awareness modes
  • Easy to operate, mount & learn IR sniper sight
  • Manually adjustable objective lens
  • Real-time video output / display
  • Multiple color palettes
  • Real time target temperature measurement Detection w/graph
  • Military grade germanium optics
  • Sensitivity to 1/10th of a degree
  • Immune to solar/intense energy sources
  • Top of the line thermal scope with outstanding detail enhancement
  • Ultra rugged, hardened inside and out
  • Precision accuracy Long range clip on thermal scope
  • User selectable multiple real time target acquisition modes
  • Wireless remote control
  • Monochrome, reverse polarity and various color pallets
  • Comprehensive, easy to maneuver menu interface
  • Tactile direct man to machine button ology
  • Waterproof
  • External Wi-Fi module
  • Integral MIL-STD-1913 rails for optional accessories
thermal clip-on sight image flir imaging
thermal clip-on rifle scope image of cars
Iron thermal imaging color palette
thermal image of wild pigs in a field

SPI Long range thermal imaging scopes, Sample HOTGLOW Sensitivity videos

SPI long-range thermal imaging scopes, like the SPI Dauber T640-50-C, are high-performance, precision-engineered devices designed for tactical and professional use. They excel in revealing minute temperature variations in natural and man-made objects, enabling clear imaging in near-total darkness. These scopes are characterized by high-sensitivity infrared imaging, advanced optics, and robust construction suitable for challenging environments


SPI thermal rifle scopes and sights use the latest technology in infrared imaging to reveal even slight temperature fluctuations and variations that occur in both man-made and natural objects. They use that information to generate an image even in near to total darkness. With multi-coated, Germanium lenses and compact, sturdy housing, our sights are water, dust, and sand-proof for unmatched reliability in uncharted territories, rough terrain, and extreme weather conditions. Our thermal weapon sights also offer:

A fully adjustable electronic fine reticle for precision shooting
Professional-grade lens materials and ergonomic design
A digitally controlled boresight, which allows to change the position of your reticle without losing sight of the running center coordinates
A locking quick-release mount
Wireless remote control
High sensitivity Long range clip on thermal scope
Option to use either CR123A Lithium batteries or additional battery packs

Our Long range clip on thermal scope / sights are developed using the science of black body radiation, which demonstrates that objects with a temperature above absolute zero must emit infrared radiation. Radiation levels increase or decrease in response to changes or variations in an object’s temperature; thermal photography, or thermography, works by detecting the level of radiation that an object emits and translating it into an image. A thermal weapon sight, otherwise called a thermographic weapon sight or thermal imagery scope, combines a thermographic camera and an aiming reticle in one device that can be mounted on a variety of weapons. SPI’s superior thermal weapon sights are made from high-grade construction materials that are lightweight, weather-resistant, and tough.

We offer a wide range of field-tested, Military-grade thermal weapon sights. They feature:

One Shot Zero with Freeze Function
long range FLIR Thermalradar imaging  scopes will mount to all rifles
Digital boresight function
Target Temperature Measurement
Variable gain control
5 Zeroing profiles
Powered by two CR123A Lithium batteries
Stadiametric rangefinder
High resolution 1024×768 display
Long range clip on thermal scope
Automatic or Manual (silent) Calibration

All SPI Long range clip on thermal scope are built to last, with high-quality construction and a host of features that allow our customers to feel safe, adaptable, and fully in control during covert operations, territory exploration, routine enforcement, and everything in between. Our thermal rifle scopes are water and fog-resistant, and always created for the most demanding tactical professionals. SPI customers know that our products offer superior quality and exceptional performance that’s low-maintenance and cost-effective.

SPI presents an extensive array of durable, all-weather thermal rifle scopes and FLIR weapon sights, designed to endure high recoil and excel in nighttime target acquisition. These long-range thermal scopes integrate a thermal imaging detector and a germanium lens, encased in a hardened, rugged housing. They offer a variety of reticle options, environmental image enhancements, and digital corrections, making them ideal for professional hunters, law enforcement, and military use. Equipped with standard 1913 Picatinny Weaver rails, accessory mounts, shot counters, and electronic zoom, these scopes are compatible with AA or CR123 batteries. They are fully sealed to resist rain, snow, and humid conditions, ensuring reliability in diverse environments.

How Thermal Infrared Imaging or “FLIR” Rifle Scope Technology Works in a Thermal Weapon Sight


SPI’s Long Range Clip-On Thermal Scopes incorporate advanced thermal night vision technology with uncooled FPA sight and scope FLIR technology. This setup forms a completely passive infrared weapon sighting system. It allows users to detect heat signatures of individuals or objects in various conditions – day or night, and even in rain, fog, or smoke. This technology does not require an external flash infrared (IR) illuminator light source, making it versatile for use in total darkness or bright daylight.

The scopes’ ability to detect heat-emitting objects, such as humans and recently-operated vehicles, allows them to stand out starkly against their backgrounds, effectively penetrating camouflage and other visual concealment methods. Built to rugged standards, these FLIR thermal rifle scopes are resilient, shock, and water-resistant, and can endure the forces generated by repeated recoil. They come with a quick-detachable mount for fast attachment to Mil-Std-1913 Picatinny rails and weapon receivers

thermal image of a man with a rifle

Furthermore, these scopes offer versatility through their interchangeable mounting on different weapons without significant changes in point of impact. Their electronic reticles are available in various shapes, designs, and sizes, enabling precise targeting. The scopes are powered by AA batteries or CR123 lithium types and come with auxiliary power ports for alternative power sources. They also feature a vision video output port for external display or recording.

The thermal imaging cameras in these scopes are available in two main types: Uncooled (LWIR Long wave infrared) and Cryogenically cooled. Uncooled units operate at room temperature, are completely quiet, activate immediately, and have built-in batteries. Cryogenically cooled systems offer higher resolution and sensitivity by cooling the elements inside a container below 32 F (zero C). These high-performance systems can detect minute temperature differences from significant distances.

Moreover, the technology behind these systems involves sophisticated image enhancement. Night-vision devices (NVDs) use an image-intensifier tube to collect and amplify infrared and visible light. This tube converts photons into electrons and back, amplifying the light collected by the objective lens. The microchannel plate (MCP) in the tube multiplies the electrons, creating a brighter, less distorted image. NVDs have evolved over generations, with each generation bringing significant advancements in technology and performance.

In summary, SPI’s Long Range Thermal Scopes and FLIR weapon sights offer a highly advanced, versatile, and rugged solution for thermal imaging and night vision. Their ability to operate in various environmental conditions, coupled with their sophisticated image enhancement technology, makes them an essential tool for military, law enforcement, hunting, and surveillance applications.

Thermal Laws And Regulations

Night Vision Laws and Regulations

Get In Touch

Get in touch for demonstrations or more information regarding our advanced M1-D Thermal Imaging PTZ Security Camera and the systems inside of our long range thermal PTZ cameras and drone gimbal cameras.