Guide TU425S Thermal Scope

The Guide TU425S Thermal Scope brings advanced thermal imaging into a compact, lightweight LPVO-style platform, making it the most portable option within Guide's TU 3.0 Series.

Featuring a 400×300 12μm thermal sensor with 20mK NETD thermal sensitivity, the TU425S is paired with a 25mm F1.0 objective lens and provides a detection range of up to 1300 metres. Its compact design weighs just 575g, helping reduce bulk while still delivering strong thermal performance.

Guide's ApexVision S1 image processing architecture and Hyper-Light algorithm work together to enhance image clarity, contrast and detail, while Shutterless 3.0 technology provides smooth viewing with minimal interruption.

With a high-resolution 1920×1080 AMOLED display, 4.3×–17.2× magnification, up to 10 hours of battery operation, dual-band Wi-Fi, recording functionality and an IP68 protection rating, the TU425S delivers a capable thermal optics platform in a streamlined package.

Includes quick-release scope mount.

ApexVision S1 Image Processing

The TU425S features Guide's ApexVision S1 image processing architecture, developed to enhance thermal image clarity, definition and overall viewing performance.

Advanced image processing works alongside the thermal detector to improve contrast and detail while reducing image noise, helping users distinguish heat signatures and surrounding terrain across changing environmental conditions.

400×300 12μm Thermal Sensor

At the heart of the Guide TU425S is a 400×300 thermal detector with a 12μm pixel pitch.

With a specified 20mK NETD thermal sensitivity, the sensor is designed to detect small temperature differences within a scene and provide useful thermal detail in low-contrast environments.

A 50Hz frame rate provides smooth imagery when scanning or observing moving subjects.

25mm F1.0 Lens & 1300m Detection Range

The TU425S features a 25mm F1.0 objective lens, providing a practical balance between field of view, magnification and longer-distance thermal detection.

The optical system provides a stated detection range of up to 1300 metres, making the TU425S well suited to short- and medium-range thermal observation while retaining a relatively compact overall footprint.

4.3×–17.2× Magnification

The Guide TU425S provides 4.3× base magnification, offering a detailed initial view while maintaining a useful field of view.

Magnification extends up to 17.2×, allowing users to examine detected thermal signatures more closely when additional image detail is required.

Its field of view measures approximately 10.3° × 6.2°, or 18 × 11 metres at 100 metres.

Lightweight LPVO-Style Design

One of the defining features of the TU425S is its compact LPVO-inspired design.

At approximately 575g, the TU425S is designed to provide advanced thermal capability without the bulk traditionally associated with larger thermal optics.

Its streamlined housing helps create a more familiar optic-style profile while improving portability and overall handling.

Hyper-Light Image Processing

Guide's Hyper-Light algorithm works alongside the thermal detector and ApexVision architecture to enhance image contrast and reduce unwanted noise.

The processing system is designed to preserve finer thermal detail, helping produce a clearer and more defined image across varying field conditions.

Shutterless 3.0 Technology

The TU425S features Guide Shutterless 3.0 technology, designed to minimise interruptions caused by traditional thermal calibration cycles.

This provides smoother, more continuous viewing and reduces audible clicking during normal operation.

A shutter module is still retained for startup calibration and operation under extreme temperature conditions to help maintain image quality.

1920×1080 AMOLED Display

The TU425S features a high-resolution 0.49-inch 1920×1080 AMOLED display, providing a clear and detailed presentation of the thermal image.

Available thermal palettes include White Hot, Black Hot, Red Hot, Green Hot, Iron Red, Blue Hot and Sepia, allowing the viewing experience to be adapted to different environments and user preferences.

A -5D to +5D diopter adjustment allows the eyepiece to be fine-tuned for individual eyesight requirements.

Dual-Battery Power System

The TU425S uses a dual-battery configuration consisting of a built-in 18500 battery and an external 18650 battery.

Together, the system provides up to 10 hours of operating time, helping support extended field use.

The scope also supports 5V DC 2A USB-C power, providing an additional option for powering the unit from a compatible external source.

Photo, Video & Audio Recording

The Guide TU425S supports photo capture, video recording and audio recording, allowing observations to be documented directly through the scope.

This provides a convenient way to capture thermal footage without requiring a separate recording device.

Dual-Band Wi-Fi Connectivity

Built-in 2.4GHz and 5GHz Wi-Fi connectivity allows the TU425S to connect with compatible external devices.

Wireless connectivity provides access to supported features such as image transmission, sharing and device management.

IP68 Weather Protection

The TU425S carries an IP68 protection rating, providing strong protection against dust and water exposure during demanding outdoor use.

Its specified operating temperature range of -20°C to 50°C allows the scope to operate across a broad range of environmental conditions.

Quick-Release Scope Mount Included

The Guide TU425S includes a quick-release scope mount, providing a convenient mounting solution straight out of the box.

Quick-release mount scope tube torque: less than 2.5N·m / 22.13 in-lb.

Guide TU425S Specifications

Why Choose the Guide TU425S?

The Guide TU425S Thermal Scope is designed for users wanting capable thermal imaging in a lighter and more compact optic-style platform.

Its 400×300 12μm sensor, 25mm F1.0 lens and 1300m detection range provide strong thermal observation capability, while the 4.3× base magnification and 575g weight make it a particularly portable option within Guide's TU 3.0 range.

With ApexVision S1 processing, Hyper-Light image enhancement, Shutterless 3.0 technology, a 1920×1080 AMOLED display, dual-battery power system, recording functionality, dual-band Wi-Fi, IP68 protection and an included quick-release mount, the TU425S combines advanced thermal features with a streamlined and lightweight design.