ECHO SV35 Thermal Sight: Range Targets in Absolute Darkness

• High-Definition Thermal Core: Provides crystal-clear thermal identification in any weather or light condition, cutting through fog, smoke, and foliage.
• Integrated 1000yd Laser Rangefinder (LRF): Delivers instantaneous, precise range data, eliminating guesswork for immediate ballistic solutions.
• BDX 2.0 with Applied Ballistics Ultralight: Calculates your exact firing solution and displays the correct holdover point directly on your reticle, guaranteeing first-shot accuracy.
• 11+ Hour Run Time from Dual 18650 Batteries: Ensures maximum operational readiness for extended missions and long surveillance without frequent battery swaps.

Common Accessories to Add to the Sig Echo SV35

• BOBRO Quick Release Mount: Allows for rapid, repeatable attachment and detachment of the sight from your primary weapon platform, enhancing weapon versatility without sacrificing zero integrity.
• High-Capacity External Power Bank (USB-C Compatible): Supplements the internal batteries, providing crucial power for multi-day operations and prolonged observation tasks, ensuring 24/7 readiness.
• High-Durability Hard Case (IP68 Rated): Provides crush-proof, shock-proof, and dust-tight protection for transport, safeguarding the sophisticated thermal optics in extreme environments.
• Optics-Grade Germanium Lens Cleaning Kit: Essential for maintaining the clarity and sensitivity of the thermal lens, which is critical for peak thermal signature detection.

Sig SV35 Features and Specifications

The ECHO SV35-LRF is built around a powerful Low-Wave Infrared (LWIR) core, which works by detecting minute heat signatures rather than visible light. Think of it as "heat vision" that sees the world in terms of temperature difference, allowing you to instantly locate people, animals, and heat sources regardless of darkness or atmospheric conditions. This thermal data is then fed directly into the on-board ballistic computer (BDX 2.0), which uses the integrated 1000-yard laser rangefinder to measure distance. The system performs all necessary calculations—including factoring in ballistics, range, and environmental data—and projects the precise aiming solution onto your reticle. It takes complex long-range engagement and makes it as simple as: Range. See the Dot. Engage.

Key Features

• Multi-View Customization: Features 8 Selectable Color Palettes (including White Hot, Black Hot, and Red Hot) allowing you to optimize target detection and contrast against varied backgrounds and environmental conditions.
• Mission Documentation: Includes 32GB of internal solid-state storage to record high-definition still photos and video with audio, providing vital media for mission debriefs and after-action review.
• Ruggedized Durability: An IP67 waterproofing standard certifies the unit to be fully dust-tight and protected against temporary water immersion, guaranteeing function in the harshest operational climates.
• Versatile Mounting: Utilizes a standard Cantilevered Picatinny Rail Mount for secure, stable, and widely compatible mounting on modern rifle platforms.

Technical Specifications

• Thermal Core: LWIR 640x512 VGA, 12 micron Pixel Pitch, 50Hz Refresh Rate.
• Thermal Sensitivity: Less than 20mK (A lower milli-Kelvin (mK) value indicates higher thermal sensitivity, meaning the sight can detect smaller temperature differences for superior image quality).
• Rangefinding Capacity: Integrated 1000 Yards (Laser Rangefinder).
• Magnification: 1.5x (Base Optical) - 12x (Maximum Digital Zoom).
• Power: (2) 18650 Lithium-Ion Rechargeable Batteries.
• Run Time: 11+ Hours.
• Waterproofing Standard: IP67 (Rating: Fully protected from dust and effects of temporary immersion in water up to 1 meter).
• Dimensions: 10.7 inches (Length) x 4.0 inches (Width) x 3.5 inches (Height).

What’s in the Box of the Echo SV35

• (1) ECHO SV35-LRF Thermal Sight
• (2) 18650 Rechargeable Lithium-Ion Batteries
• (1) Cantilevered Picatinny Rail Mount
• (1) Protective Lens Cover/Cap
• (1) Battery Charger and Charging Cable
• (1) Soft-Sided Pouch or Carry Case
• (1) Owner's Manual

Echo SV35 FAQs

What does less than 20mK thermal sensitivity mean for the performance of this Thermal Imaging Scope?

The mK (milli-Kelvin) measurement indicates the Noise Equivalent Temperature Difference (NETD). A sensitivity of less than 20mK means the sensor can distinguish between two objects that differ in temperature by only 0.02 degrees Celsius or less. This ultra-low mK rating is a key indicator of high-end performance, providing superior detail and clarity even in challenging low-contrast conditions (e.g., humid air or slight temperature variations).

How does the BDX 2.0 system integrate with the Laser Rangefinder?

The BDX (Ballistic Data Xchange) 2.0 system is a proprietary electro-optics technology. When you press the LRF button, the rangefinder measures the distance to the target (up to 1000 yards). This data is instantly combined with your pre-loaded ballistic profile (caliber, bullet weight, velocity) and environmental sensors to calculate the precise holdover point. The correct aiming point is then illuminated directly on your thermal reticle, significantly simplifying and speeding up long-range engagement.

What is the correct way to write the product name? Is it Echo SV35 Sig, Sig Echo SV 35, Sig SV 35, Sig Echo SV-35, Echo S V 35 LRF, or the Sig Echo 35SV?

The correct, formal product designation is the ECHO SV35-LRF THERMAL SIGHT. It's important to include the "ECHO" and "LRF" designations to specify this model, which features the 640x512 core and the integrated laser rangefinder. Using the correct name ensures you receive the precise Thermal Weapon Sight you intended to purchase.

What calibers can I use this LRF Thermal Sight with?

Because the BDX 2.0 system uses Applied Ballistics Ultralight, it's compatible with nearly every common rifle caliber (e.g., .308, 6.5 Creedmoor, 5.56 NATO, etc.). You simply download the BDX app to your smartphone, create a custom ballistic profile for your specific rifle/ammunition, and wirelessly upload it to the sight. The sight will then use that exact data for its aiming solutions.

How do I maintain and clean the echo sv35-lrf thermal sight 1.5-12x35mm?

The sight's objective lens is made of Germanium, which is highly effective for thermal transmission but requires care. Use only a dedicated, optics-grade cleaning solution and a lint-free cloth or lens brush. Never use abrasive materials or common glass cleaner. Gently wipe or brush the lens to remove dust and debris to maintain optimal thermal sensitivity.

How long do the batteries last, and are they proprietary?

The sight achieves an impressive 11+ hours of continuous run time using two standard 18650 rechargeable lithium-ion batteries. These are not proprietary, meaning you can easily source replacement or backup batteries from many retailers, ensuring you are never caught without power. The rechargeable nature also provides significant long-term cost savings.

Where is the best place to purchase the ECHO SV35-LRF and ensure I get a genuine product?

The most reliable place to purchase the ECHO SV35-LRF Thermal Sight is through Atomic Defense. As a leading online retailer of defense and military gear and an authorized dealer for SIG SAUER Electro-Optics, we guarantee you receive a factory-new, genuine product eligible for the full SIG SAUER Infinite Guarantee™ and all manufacturer support. Purchase with confidence knowing you have full warranty protection.

Is the Thermal Weapon Sight truly waterproof, and can it handle recoil?

Yes. The unit has an IP67 rating, which means it's protected from total dust ingress and temporary immersion in water up to 1 meter deep for 30 minutes. Furthermore, it is designed and built to withstand the high mechanical shock and sustained recoil of modern sporting and tactical rifles.