The Best Thermal Scopes of 2023

Thermal scopes don’t just level the playing field; they tip the field decidedly in favor of users because they cheat nature by allowing us to see through the dark. The advantage they give hunters is the main reason they’re prohibited for most game hunting. But for unregulated non-game animals, like coyotes and feral hogs in many states, they’re an unequaled aid. They have plenty of other uses, from finding your child in the dark to detecting electrical shorts inside walls.

It’s a category in the process of rapid evolution. New models have on-board rangefinders, high-definition video and still photo capability, and even Bluetooth connections to mobile apps. Even better, the price for many of these units has fallen to a level where they’re affordable for nearly every budget. So which thermal is for you? Read on for reviews of the best thermal scopes available. 

• Best Overall: Pulsar Thermion 2 LRF PRO
• Best Value Clip On: AGM Rattler TC35-384 Thermal Clip-On
• Best Handheld: Zeiss DTI 3/35
• Best Military-Grade: Trijicon IR-Hunter 35mm
• Best Reflex Sight: X-Vision Thermal Reflex Sight Wide View
• Best Budget: Sightmark Wraith 4k Mini
• Best Clip-On: Leica Calonox
• Best for $1,000: Liemke Keiler-13 PRO
• Best for ARs: Burris BTS50 Thermal Riflescope

Best Thermal Scopes: Reviews & Recommendations

Best Overall: Pulsar Thermion 2 LRF PRO

Key Features

• Capable of detecting heat signatures out to 2,000 yards
• Built-in laser rangefinder has a stated range of 875 yards, and effective range of about 500 yards
• 2-16-power magnification range
• Built-in photo and video recording, which can be stored on 16GB memory or streamed via on-board Wi-Fi to mobile app
• Ten digital reticles
• Nine different color palettes

Pros

• Tons of useful features
• Long detection range 
• Excellent resolution and detail
• Intuitive ergonomics

Cons

• Limited inventory (currently)
• Refresh rate could be faster

In terms of products available on the civilian market, this rangefinding riflescope has the best combination of range, detection sensitivity, ease of use, and ample mounting dimensions. It’s also among the more durable units, and its combination of on-board and removable batteries is a key asset to keep it cranking in cold weather. Its data-capture-and-share capability is impressive. It has the ability to record both photos and videos, and then share to a mobile app via its built-in Wi-Fi.

While the unit can detect heat signatures out to 2,000 yards, it only really becomes useful inside about 500 yards, when images start to gain resolution and the rangefinder—rated out to 875 yards—can identify targets quickly and with pretty good precision. The rangefinder has an inclinometer, unusual in this class of scope, and a ballistic calculator that can prescribe shooting solutions. The magnification range—2x out to 16x—is useful, as is the ability to choose between 10 reticles and nine different color modes. For precision shooting, the “picture-in-picture” mode, which magnifies the aiming point, is a useful feature.

The ergonomics and ease of use are both excellent, starting with the ambidextrous focus control on the thermal housing near the objective bell. The three-button control pad near the eyepiece is intuitive and textured to make navigation in total darkness repeatable after a few uses.

In terms of its guts, the Thermion 2 is powered by a 640×480 microbolometer resolution sensor and a sharp 1024×768 AMOLED display that pops against just about any background.

Let’s talk about its price—over $6,500—and its scarcity. This product hasn’t been available for a few months, and there’s a good deal of uncertainty over sourcing for a number of brands, besides Pulsar. It’s enough to suggest that instead of germanium, the material thermal manufacturers are using might as well be called unobtanium.

While much of the Thermion 2 looks and behaves like a traditional riflescope, the processor that’s mounted above the objective bell is bulky and throws off the balance. The refresh rate is better than earlier iterations of this scope, but I still wish it was a little faster. While using this scope on a Texas hog hunt, I found that it froze at the most inopportune moments, a situation that’s easy to resolve with manual refresh.

Best Value Clip On: AGM Rattler TC35-384 Thermal Clip-On

Key Features

• Weight: 0.93 pounds
• Magnification: 1x (2x,4x,8x digital)
• Resolution: 384 x 288
• OLED Display: 748 x 561
• Objective Lens Diameter: 35mm
• Detection Range: 1,235 Yards
• Frame Rate: 50 Hz 
• Pixel Pitch: 17 um
• Waterproof and Shockproof: IP67 Rating
• External Power Supply Capable
• 4.5 Hour Runtime on CR123 batteries
• 16 GB Storage for Videos and Pictures

Pros

• Good battery life and can run on an external battery pack
• Can be moved from rifle to rifle
• Allows the user to use their day scope’s turrets for longer shots
• Records video and images 

Cons

• No sound recording with video
• It takes about 3 seconds to get a video recording started 

The AGM Rattler TC-35 is the best value thermal clip on for a few important reasons: digital zoom, external battery compatibility, and video recording.

The biggest standout is its digital 2x, 4x, and 8x zoom. This makes it quite useful as a handheld monocular. If you want to use it as a dedicated monocular, I’d pick up the optional eye piece for about $300. The eyepiece makes the image appear larger to your eye while using it as a monocular. Even without the eye piece, it’s a serviceable monocular when it’s not on your gun. 

The Rattler has external battery capability. This is a huge plus if you want to hunt for more than 4 hours or hunt in extreme weather. Freezing temperatures will kill a normal CR123 battery quickly, but an external battery pack rated for 20 hours will let you hunt without worrying about battery life. External batteries are also easy to wrap a hand warmer around, extending operating time greatly.

The rattler records video and takes photos. It boasts 16 GB of onboard storage, which is plenty to get you through even the most active hunts. Be aware that there is no microphone, so the recordings have no sound. To get around this, I purchased a cheap audio recorder the size of a pack of gum for when I want the audio. Unless you are a YouTuber like me, you probably won’t care much about the audio, but it is worth noting. My only real complaint with the video function is that it requires a long press of 3 to 4 seconds to start. That can feel like a long time when a coyote is passing through. 

One thing to remember when using this unit or any other clip-on is that less magnification on your day scope is better. Low magnification lets you see more of the OLED display. More magnification is helpful for longer shots but restricts your field of view. For this reason, I like a second-focal plane scope with low magnification and illuminated reticle. I find the sweet spot to be around 5x magnification when using clip-ons.

My Rattler is incredibly repeatable when taking it on and off of the rifle, holding within 1 inch of zero at 100 yards. I have also found that when attaching it to the scope bell, it can be used on scopes of the same brand and model without re-zeroing the thermal unit. That’s why I own multiple rifles with the same brand and model scope on them. This allows me to choose which rifle is best for the task at hand, whether it be an AR-10, bolt gun, or airgun all without touching the clip-on’s settings.

At about $2700, this optic packs in a ton of features and is a great option for owning the night.—Keith Gibson

Best Handheld: Zeiss DTI 3/35

Key Features 

• Weight: 14.5 ounces
• Height: 2.6 inches
• Display: 1.6 inches
• Magnification: 1-4-power
• Thermal Sensor Resolution: 384 x 288
• Display Resolution: 1280 x 960
• Pixel Pitch: 17 um
• Frame Rate: 50Hz
• Field of View: 57 feet at 100 yards
• Range: 1,350 yards
• Four color palettes (white hot, black hot, red hot, rainbow)

Pros

• Picture-in-picture feature
• Hot tracking mode
• High frame rate reduces flickering
• Bluetooth connectivity with Zeiss Hunting app
• Excellent controls and ergonomics
• Good battery life

Cons

• At about $3,000, it’s pricey
• Does not mount to a rifle

This is Zeiss’s entry into the thermal imaging realm, and it’s a good freshman effort, with very thoughtful design and decent performance. Note that Zeiss offers a companion 3/25 unit with a much wider view that’s useful in close quarters like woods and bait sites. With a 1,350-yard range, the 3/35 is better for open fields where you have longer detection ranges. Because of European prohibitions on the manufacture and marketing of devices that have military applications, rifle-mounted thermal scopes are simply not a thing there. Hence, the introduction of so many thermal viewers from European brands. The big question for American buyers is whether a hand-held viewer is as useful as a rifle-mounted thermal scope.

While an all-in-one scope is certainly a better option for many uses—hog and predator hunting, among them—I got a lot out of this Zeiss as a tracking tool, (non-game) animal spotter, and to find my pickup after an after-hours hunt got me turned around. 

Best Military-Grade: Trijicon IR-Hunter 35mm

Key Features

• Integral QLOC Picatinny mount
• Intuitive knobs control most functions
• 8x digital zoom
• 640 x 480 sensor resolution
• Selectable reticles
• USB cable connection to transfer media

Pros

• Durable and weatherproof
• Easy mounting
• Good reticle options

Cons

• Not the best in-class resolution

This is a battle-proven, made-in-America thermal, essentially the little brother to models used by our armed forces. The exterior style and controls get at that front-line heritage; the housing is robust and metallic, and even the battery housing is weatherproof. But the IR-Hunter’s best crossover attribute is its knobs that control most functions. This is a wide departure from the push-button navigation of most plasticky thermals, and once you get the hang of them, you won’t want to go back. The knob clicks have pleasing positivity, and allow users quick and sure adjustments in the field.

I like the reticle options, and the ease of mounting to a variety of firearms platforms.

At over $7,000 for the 35mm version (Trijicon also offers 24mm and 60mm versions of this thermal scope), it’s not a casual purchase, and users want the assurance that they’ll have years of service and institutional support. The mil-spec Trijicon unit exudes that assurance. Because the IR-Hunter is made right here in America, you can expect the warranty and product support will be hassle-free.

For all its exterior attributes, the resolution of the Trijicon is a little underwhelming. While its 12-micron pitch rate is on par with its peers, the image seems slightly fuzzy. I’m on the fence about whether I’d trade some of its robust build for a Bluetooth receiver that might wirelessly transmit photos and video. Media sharing is a nice addition, and is becoming an industry expectation. But because the IR-Hunter is built for serious shooters, the need to record an encounter and/or shot is largely an afterthought.

Best Reflex Sight: X-Vision Thermal Reflex Sight Wide View

Key Features 

• Weight: .55 pounds
• Height: 3 inches
• Display: 1.6 inches
• Magnification: 1-4-power
• Pixel Size: 17 um
• Frame Rate: 25Hz
• Field of View: 250 feet at 100 yards
• 650 nm laser
• Four color palettes (white hot, black hot, red hot, full color)
• Four reticle choices

Pros 

• Quick-release Picatinny mount
• Compatible with ARs and crossbows
• Extra-wide field of view
• 500-yard detection range

Cons

• Limited utility
• Pricey for niche product
• Tediously small controls

A sized-down thermal sight for fairly specific uses, this is the reflex sight for night hunters. Its detection range is limited to 500 yards for vehicle-sized targets, and closer to 200 yards for pig-sized targets. But given that most shots on nocturnal pigs and predators are inside that distance, it’s a good choice for AR rifles because of its capability for fast follow-up shots. It’s also a very handy tracking tool, because at 1x the X-Vision Thermal Reflex Sight can take in a lot of ground and then assist in fast, close follow-up shots.

Read Next: Best Thermal Cameras

Best Budget: Sightmark Wraith 4k Mini

Key Features 

• Weight: 1.35 pounds
• Height: 2.9 inches
• Magnification: 2-16-power
• Saves five rifle profiles 
• Objective Lens Diameter: 32mm
• Thermal Sensor Resolution: 3840 x 2160
• Display Resolution: 1280 x 720
• IR Wavelength: 850nm
• Field of View: 40 feet at 100 yards
• 4K recording with sound
• 14 reticle options in both first- and second-plane configurations
• Nine color palettes

Pros 

• On-board video recording with audio
• 14 reticle options with nine colors
• Daytime and night-vision modes
• Durable aluminum housing
• Both first- and second-plane reticles
• USB-C external power connector
• Appealing price

Cons

• Effective range limited to 300 yards
• Sluggish operation in cold temperatures
• No on-board rangefinder

Consider this the thermal scope for us mortals. Priced well under $1,000, the Wraith offers a wide range of features and utility for hog and predator hunting at night, but also daytime hunting and shooting. The scope, also available in a 4-32-power version, is easy to mount on a variety of platforms with a repeatable zero using the fixed Picatinny mount.

Best Clip-On: Leica Calonox

Key Features

• 2,000-meter detection range, 700-meter “recognition” range, 350-meter “identification” range
• Sensor Size: 384 x 288 pixels
• Screen Resolution: 1024 x 768 pixels
• OLED display

Pros

• Excellent battery life
• Turns your day scope into a thermal

Cons

• Limited capability as a monocular due to 1X magnigication

Clip-on monoculars pull double duty as hand-held thermal devices and as rifle-mounted aiming aids. Because of their split personalities, they don’t do either especially well, but they are remarkable for performing each task pretty capably.

Let’s talk first about the riflescope accessory. First, note that you’ll need to buy the correct adapter that connects your riflescope’s exterior objective bell diameter with the interior dimensions of the Leica unit. There are plenty of aftermarket clips that achieve this mating. Once you connect the scope with the thermal, operation is simple. You use your scope’s reticle and turret subtensions to put your round on target, and the 1x magnifying thermal unit simply becomes a magic lens that sees into the night. All other riflescope operations—magnification, reticle subtensions, and turret controls—remain the same. This capability cannot be overstated. You don’t need to replace your favorite scope with a thermal unit with limited utility, and you don’t need to invest in a specialized thermal monocular. This single unit bridges that performance gap.

As a hand-held thermal monocular, the unit provides decent resolution but class-leading field of view, thanks to that 1x magnification. While this is a subjective assessment, the build of the Leica is among the most durable of the field.

Because this is designed to be used as a thermal accessory for a standard riflescope, the Calonox doesn’t have a magnification feature. Whether this is a bug (for hand-held users) or a feature (for shooters) depends on your perspective. It can capture still photos, but not videos. And with no on-board memory, it desperately needs to transmit images to your phone or other device, which it can do via Bluetooth. At over $4,000, this is a pricey unit.

If you’re looking for a budget friendly clip-on thermal, check out the AGN TK.

Read Next: Best Night Vision Goggles

Best for $1,000: Liemke Keiler-13 PRO

Key Features 

• Weight: 11.6 ounces
• Height: 6.3 inches
• Display: 0.39 inches
• Magnification: 2-power
• Objective Lens Diameter; 13mm
• Detection Range: 500 yards
• Thermal Sensor Resolution: 240×180 pixels
• Pixel Pitch: 17 um
• Frame Rate: 50Hz
• Field of View: 164 feet at 110 yards
• Five color/contrast modes

Pros 

• Very good battery life
• Tripod mount
• Extremely light weight
• Very wide field of view
• “Hot Spot” tracking feature

Cons

• Relatively small objective lens
• Video transfer requires cable
• Hard to mount on a rifle

Both simplicity of operation and a very appealing price—about $1,100, depending on the strength of the Euro—make this a good choice for hunters and wildlife viewers getting into thermal imaging. The Keiler-13 (it means boar in German, which gives you an idea of its customer and purpose) has intuitive controls and a surprisingly good image, given the relatively small objective lens. Video and still-image capability are both good, though you must connect a cable to the device to export images. The threaded tripod adapter is an excellent addition we wish more brands would incorporate.

Best for ARs: Burris BTS50 Thermal Riflescope

Key Features

• 2x and 4x magnification
• 400 x 300 thermal resolution
• 1024 x 768 screen resolution
• Five selectable color palettes
• Ranging feature
• Ten reticle options
• Picture-in-picture mode for precise aiming
• Available in both 35 and 50mm configurations

Pros

• Easy to mount
• Easy to use in total darkness

Cons

• Cannot record video

With an integral Picatinny rail mount, this is a true plug-and-play thermal riflescope. You don’t have to dicker with rings or true the cant once you have it atop a gun. Simply mount the Burris BTS, zero it to your load, and go forth.

The unit has all the features you need, including five selectable palette options and 10 different reticle configurations. While it can record still photos and videos, you’ll need to plug in the transfer cord in order to pull images off the unit. The roller button control is far more intuitive than push-button controls of most thermal units, and once you get the hang of the controls and their functions, you can easily manipulate this unit in total darkness.

Lastly, it’s by no means a steal, but at around $3,900, the Burris BTS offers a solid selection of basic options without gilding the lily; it’s about $1,000 less than its peers. It’s a hard-wearing, reasonably priced option for shooters looking to get into thermals. The hard case that contains the Burris is also a really nice asset.

While the imaging screen is perfectly adequate, the thermal sensor could use some help. At 400 x 300 pixels, it’s a little below the industry norm for this type of device. And, while I know it’s a gimmick with limited utility, I really do like the ability to record video on my thermal and transmit it to a buddy via Bluetooth. The Burris can’t quite do that. Lastly, its five palettes are solid, but it’s always nice to add a couple more, and the BTS seems relatively stingy in comparison to industry standards.

Read Next: Best Night Vision Scopes

Things to Consider Before Buying a Thermal Scope or Viewer

The first thing you should consider if you’re in the market for one of the best thermal scopes is how you’ll use it. Do you want a rifle-mounted scope, with reticle and even a built-in laser rangefinder? If that’s the case, then you’re looking at a fairly expensive subset of thermals. Or maybe you just want a unit to see into the night. A hand-held thermal will do just fine, at a fraction of the cost of the thermal scopes, but without any ability to place after-hour shots.

Second, consider your budget. You can spend anywhere from about $1,000 to well over $10,000 on these devices. But if you’re simply interested in a viewer to detect animals or maybe a car parked at a trailhead, you won’t need all the bells and whistles of a scope. But if you want a plug-and-play scope to shoot coyotes or varmints after legal shooting light, then you should expect to pay well over $3,000 for the most capable rifle-mounted sights.

FAQs

Methodology 

I requested a number of models of thermals from a wide variety of companies. Some submitted rifle-mounted thermal scopes, others sent hand-held thermal viewers. I mounted the scopes to both AR and bolt rifles and put each submission through a field of fire, engaging nocturnal targets from 50 to 500 yards. I assessed their ease of use, ability to sight in and then engage targets at a variety of distances, and I used the full complement of reticles, palettes, and magnifications that they offer. The hand-held viewers were harder to assess, because they’re not precision aiming devices. With those units, I tested their battery life, ability to detect fine and coarse targets, and their ease of operation.

I rated each unit on 10 different criteria and took off points for confusing menus and clunky ergonomics.

Final Thoughts

The best thermal scopes and hand-held viewers are getting more affordable and accessible by the day. Until you are able to see through the darkness and pick up thermal signatures several hundred yards out in the field, you might not think you need one of these devices. But once they reveal all the hidden secrets of the night, you’ll want one just to see what happens around you in the dark.

But not all thermals are created equally. Generally speaking, you get what you pay for, with the cheaper units lacking some crucial attributes, but the most expensive having more modes and capabilities than most people normally need.

• Best Overall: Pulsar Thermion 2 LRF PRO
• Best Handheld: Zeiss DTI 3/35
• Best Military-Grade: Trijicon IR-Hunter 35mm
• Best Reflex Sight: X-Vision Thermal Reflex Sight Wide View
• Best Budget: Sightmark Wraith 4k Mini
• Best Clip-On: Leica Calonox
• Best for $1,000: Liemke Keiler-13 PRO
• Best for ARs: Burris BTS50 Thermal Riflescope

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