Liemke Keiler-25 LRF Thermal Imaging Monocular

• Integrated laser rangefinder: The built-in LRF adds distance data directly to thermal observation, helping with faster target assessment in the field without carrying a separate rangefinding device.
• 384x288 VOx sensor with 12.00 μm pixel pitch: This sensor format balances detail and compact size, making it easier to identify heat sources clearly while keeping the monocular light and easy to carry.
• 25.00 mm objective with 1250.00 m detection range: The optical setup gives the KEILER-25 LRF the reach needed for scanning open ground while still remaining practical for mixed terrain and general observation.
• LCOS display at 1280x960: A high-resolution display presents the thermal image with a clean, easy-to-read view, which supports longer observation sessions and more confident interpretation of detail.
• Compact 320.00 g housing with WiFi connectivity: Low weight and small dimensions make the monocular easy to keep on hand, while WiFi expands its usefulness for image transfer and connected use.

About the Liemke Keiler Series

The LIEMKE KEILER series is a family of handheld thermal imaging devices built for hunters and outdoor users who need a compact observation tool rather than a rifle-mounted system. Within the range, models differ in detection range, field of view, sensor configuration and lens size, allowing the series to cover everything from general-purpose woodland use to longer-range observation on more open ground. LIEMKE positions the KEILER line as a practical hunting companion for fields, forests and mountainous terrain, so the series is shaped around versatility rather than one narrowly specialized role.

A defining characteristic of the family is its pocket-sized format, which makes KEILER devices easy to carry during stalking, stand hunting and general game observation. LIEMKE also describes the controls as suitable for either-hand operation, an important detail when quick handling matters in cold weather or low light. Across the series, the design philosophy focuses on combining useful thermal reach with straightforward handling, so the user gets a compact monocular that is easy to deploy, easy to carry and suited to regular field use.

About the Liemke Keiler-25 LRF Thermal Imaging Monocular

The LIEMKE Keiler-25 LRF Thermal Imaging Monocular is a compact thermal observation device built for users who want a practical balance of reach, field coverage and ranging capability in one handheld unit. Its 2.50 x base magnification gives a natural starting view for scanning, while the 10.00 x maximum magnification extends observation when more detail is needed at distance. With a 25.00 mm objective lens and a 1250.00 m detection range, this model is well suited to general-purpose thermal use across mixed terrain, where the user may move between shorter woodland observation and more open-field spotting.

The thermal core uses a 384x288 VOx uncooled sensor with 12.00 μm pixel pitch, 35.00 mK NETD and a 50.00 Hz refresh rate. In practice, that means the image remains responsive during scanning and panning, while the sensitivity helps smaller temperature differences stand out more clearly. The 1280x960 LCOS display supports comfortable viewing, and the -4.0/+5.0 diopter range helps adapt the image to different users without relying on eyewear alone.

What sets this version apart is the built-in laser rangefinder, which adds distance information to thermal observation and makes the monocular more useful for judging position and planning the next move in the field. WiFi connectivity supports image transfer, while video recording, image capture and video output expand its use beyond simple live viewing. The housing remains notably portable at 70.00 x 52.00 x 130.00 mm and 320.00 g, with waterproof, fogproof and shockproof construction that suits regular outdoor use.

About Liemke

LIEMKE has been active in thermal imaging since 2008 and focuses on thermal imaging optics for hunting and outdoor use. The company developed its own optics from 2014, reflecting a specialization in thermal products rather than a broad general-optics catalog. Its product range includes handheld devices in the KEILER line, pre-mounted thermal devices in the LUCHS line and thermal products in the MERLIN family, showing a clear focus on field use across different hunting applications.

In 2020, LIEMKE became part of the Blaser Group. The brand is also known for integrating practical connectivity into its devices, including image transfer to mobile devices through Wi-Fi or cable. That combination of thermal specialization, hunting-focused design and a dedicated product portfolio gives LIEMKE a clear position in the thermal optics segment.

Main Features

• Magnification: 2.50 x
• Maximum magnification: 10.00 x
• Diopter range: -4.0/+5.0
• Objective lens diameter: 25.00 mm
• Field of view: 180.00 m/1000m
• Field of view (degrees): 10.50 °
• Detection range: 1250.00 m
• Thermal sensor type: VOx Uncooled
• Sensor resolution: 384x288
• Pixel pitch: 12.00 μm
• NETD: 35.00 mK
• Refresh rate: 50.00 Hz
• Calibration mode: Automatic, Manual
• Display type: LCOS
• Display resolution: 1280x960
• Image capture: Yes
• Video recording: Yes
• Video output: Yes
• Battery life: 7.00 h
• Connectivity: Wifi
• Built-in rangefinder: Yes
• Compass: Yes
• Waterproof: Yes
• Fogproof: Yes
• Special features: Fogproof, Fully multicoated, Shockproof, Waterproof
• Dimensions: 70.00 mm x 52.00 mm x 130.00 mm
• Weight: 320.00 g
• Colour: Black

Warranty

Liemke provides a 3-year warranty for the Keiler-25 LRF Thermal Imaging Monocular.