The GRL325 Thermal Imaging Monocular is a high-sensitivity infrared observation device designed for detailed thermal viewing during both day and night.

Equipped with a 384 × 288 thermal detector, 12 μm pixel pitch and thermal sensitivity below 25 mK, the GRL325 provides detailed heat-signature imaging and strong temperature differentiation across outdoor environments. A listed 55 Hz refresh rate delivers smooth thermal-image presentation when scanning areas or observing moving heat sources.

The device also features a listed thermal detection distance of up to approximately 1,640 yards (1,500 metres), six thermal image modes, built-in photo and video recording, 64GB internal storage, and manual digital alignment.

Key Features

• 384 × 288 Thermal Resolution – Provides detailed infrared imaging for detecting and observing heat signatures.
• 12 μm Pixel Pitch – Fine detector configuration designed for detailed thermal-image presentation.
• NETD Below 25 mK – High thermal sensitivity helps distinguish subtle temperature differences within a scene.
• 55 Hz Refresh Rate – Provides smooth thermal imaging while scanning and observing moving subjects.
• Up to 1,640-Yard Detection Range – Listed long-distance thermal detection capability of approximately 1,500 metres.
• Six Thermal Image Modes – Provides multiple thermal viewing options for different observation environments.
• Photo Capture – Save thermal images directly through the device.
• Video Recording – Record thermal observations for later viewing.
• 64GB Internal Storage – Provides substantial built-in space for thermal photos and videos.
• Manual Digital Alignment – Integrated digital alignment functionality for device setup.
• Day & Night Thermal Observation – Detects infrared energy without relying on visible illumination.
• Portable Thermal Imaging – Compact thermal observation system designed for outdoor use.

Product Specifications

Model: GRL325
Product Type: Thermal Imaging Monocular
Thermal Resolution: 384 × 288 Pixels
Pixel Pitch: 12 μm
Thermal Sensitivity: NETD Below 25 mK
Refresh Rate: 55 Hz
Listed Detection Distance: Up to Approximately 1,640 Yards / 1,500 Metres
Thermal Image Modes: 6
Photo Capture: Yes
Video Recording: Yes
Internal Storage: 64GB
Manual Digital Alignment: Yes
Day & Night Thermal Observation: Yes

384 × 288 Thermal Imaging

The GRL325 uses a 384 × 288 thermal detector with a 12 μm pixel pitch to detect infrared energy emitted by objects and convert temperature differences into a visible thermal image.

The 384×288 detector provides detailed thermal-image presentation, making it easier to observe separate heat signatures and distinguish smaller warm subjects within complex thermal scenes.

Because thermal imaging detects infrared energy rather than relying on conventional visible light, the GRL325 can provide thermal observation during both daylight and darkness.

High-Sensitivity NETD Below 25 mK

The GRL325 features listed thermal sensitivity below 25 mK.

A low NETD value allows the thermal imaging system to distinguish small differences in temperature, helping reveal subtle thermal details when temperature contrast between a subject and its surroundings is limited.

This provides enhanced thermal-image detail in challenging environments including high humidity, light rain, fog and scenes with relatively uniform background temperatures.

55 Hz Thermal Refresh Rate

A listed 55 Hz refresh rate provides smooth thermal-image updates during observation.

The faster image presentation is useful when:

• Scanning outdoor areas
• Following moving heat signatures
• Conducting handheld observation
• Monitoring properties
• Inspecting equipment
• Moving between observation areas

Long-Distance Thermal Detection

The GRL325 has a listed thermal detection distance of up to approximately 1,640 yards, equivalent to roughly 1,500 metres.

This provides long-distance heat-source detection for larger outdoor environments.

The stated distance represents thermal detection, meaning the presence of a heat source can be detected. Recognition and positive identification are separate capabilities and occur at different distances.

Six Thermal Viewing Modes

The GRL325 provides six thermal image modes, allowing the thermal display to be adapted for different observation environments and viewing preferences.

Multiple thermal modes provide alternative ways of representing temperature differences, making it easier to select a display presentation suited to the surrounding thermal conditions.

Photo & Video Recording

Built-in photo capture and video recording allow users to document thermal observations directly from the device.

This provides a convenient way to save thermal scenes for later review, documentation or comparison.

64GB Internal Storage

The GRL325 includes 64GB of built-in storage, eliminating the need to rely entirely on removable memory for captured thermal media.

The internal storage provides convenient space for:

• Thermal photographs
• Thermal video recordings
• Observation documentation
• Saved thermal media

Manual Digital Alignment

The device includes manual digital alignment functionality, providing integrated adjustment capability directly through the thermal imaging system.

Suitable Applications

The GRL325 is suitable for:

• Wildlife observation
• Farm monitoring
• Property inspection
• Outdoor observation
• Search-support activities
• Night-time observation
• Camping and exploration
• Electrical inspection
• Machinery monitoring
• General heat-source detection

Safety & Care

Avoid pointing the thermal detector directly at the sun, lasers, welding arcs or other intense energy sources, as these can damage the thermal sensor.

Keep the objective lens clean and dry and protect the device during transportation and storage.