Sig Sauer Echo MV50-LRF Thermal Monocular — 640x512, Integrated Rangefinder

The Echo MV50-LRF is the thermal monocular for hunters who want ranging and identification in one handheld unit, backed by the strongest warranty in the optics business. A 640x512 sensor and a built-in 1,000-yard laser rangefinder mean you find the animal and know the distance without reaching for a second device.

A Rangefinder That Talks To Your Rifle

The integrated LRF isn't just a number on a screen. Paired with a compatible Sig Echo riflescope, the MV50-LRF sends holdover solutions straight to your scope's reticle, calculated through Applied Ballistics Ultralight. Spot an animal with the monocular, range it, and your riflescope already knows where to hold before you ever shoulder the rifle. For hunters who don't run a matching Echo scope, the rangefinder still works as a standalone 1,000-yard unit — you just read the number off the monocular's display instead.

The Sensor That Makes It Work

Underneath the rangefinder is a 640x512 VGA thermal core at 12µm pixel pitch with sub-20mK sensitivity, running at a full 50Hz refresh. That combination is what actually lets you tell an animal from a warm rock at distance, not just see that something is there. 3-24x zoom off a 50mm objective covers everything from a quick scan to a hard look at something a quarter mile out.

Built To Never Be Obsolete

Sig backs every Echo optic with their Infinite Guarantee — an unlimited lifetime warranty with no receipt and no original-owner requirement. If the unit fails, Sig repairs or replaces it. If your specific model gets discontinued, you're upgraded to the current version instead. That's a meaningfully different promise than most thermal manufacturers make, and it matters on a device this expensive.

Field Practicalities

LensArmor coatings resist scratching and abrasion, and IP67 sealing shrugs off rain, dust, and the general abuse of a pack. Power comes from an internal reserve cell backed by a removable 18500 lithium-ion battery (two included), good for up to 10 hours of continuous runtime. The BDX 2.0 app connects over Bluetooth for real-time photo and video capture, live streaming, and software updates.

Key Specifications

• Thermal Sensor: 640x512 VGA, 12µm pixel pitch, LWIR
• NETD: <20mK
• Objective Lens: 50mm
• Magnification: 3-24x
• Refresh Rate: 50Hz
• Rangefinder: Integrated, 1,000-yard laser
• Ballistics: Applied Ballistics Ultralight, holdover to compatible Echo riflescopes
• Color Palettes: 8 selectable
• Battery: Internal reserve cell + removable 18500 Li-ion (2 included), up to 10 hrs runtime
• Connectivity: Bluetooth, BDX 2.0 app, photo/video capture
• Weather Rating: IP67
• Warranty: Sig Infinite Guarantee — unlimited lifetime, no receipt or original-owner requirement

Worth Knowing Before You Buy

This is a premium-tier price, and the rangefinder/ballistics integration is the reason for it — if you don't need built-in ranging or don't run a matching Echo riflescope, a non-LRF monocular at this sensor resolution costs meaningfully less. Check your state's regulations on thermal use for hunting before taking this afield; rules vary significantly by state and species.