Liemke Introduces German-Made Keiler 25.1 Thermal Monocular

Eric B
by Eric B

A few years ago, Liemke Thermal Optics became a part of the Blaser Group. Liemke have been active in the market for thermal imaging technology since 2008, and for ten years they’ve been developing their own products and solutions. It’s now time for the introduction of the German-made Keiler 25.1 Thermal Monocular, which features a thermal sensor with 384×288 pixel resolution and an OLED display with 1024×768 pixel resolution. The base magnification is 2.4x, with a digital zoom up to 10x. There are five color modes and the unit is waterproof according to IP67. All this for an MSRP of $2,777.

Liemke @ TFB:

Here are the details in full:

Liemke Introduces German-Made Keiler 25.1 Thermal Monocular

Antonio, Texas (January, 2024) – Liemke, a leader in high-definition thermal imaging for hunting and nature observation, extends its popular Keiler line with the addition of the German-made Keiler 25.1. This newest thermal monocular has 384×288 pixel resolution, a 12µm VOx sensor, and 25 mm objective lens. The advanced image processing software has two quick-change modes to provide natural looking, detailed images rain or shine. Heat signature detection capability is out to 1,250 meters making this model an excellent choice for hunting in forests or fields.

The Keiler 25.1 is also easy and intuitive to operate. The central scroll wheel controls the menu, zoom and other functions. The menu has a standard, custom, and basic mode and a quick-access menu that can be customized for frequently used functions. The design makes it easy to locate all important buttons intuitively, even in complete darkness. The Keiler 25.1 also has an internal memory capacity of 32 GB, making it simple to capture photos and videos from your hunt.

“Liemke thermal optics have been a hit with hunters here in the U.S. and those who want to observe their surroundings and nature at night,” said Jason Evans, CEO, Blaser Group. “The new Keiler 25.1 is the smallest, most compact of our Keiler line. It’s easy to carry in a pocket and delivers powerful performance.”


  • 25mm objective lens
  • Start-up time of only five seconds
  • Ceramic VOx detector with 384×288 pixel resolution
  • OLED display with 1024×768 pixel resolution
  • 50 Hz refresh rate
  • 2.4x basic magnification (digital zoom up to 10x)
  • Five color modes
  • Waterproof rating of IP67  (dustproof / waterproof for brief immersion)
  • Battery run time: up to 10 hours
  • Weight: 15.69 ounces

MSRP: $2,777.00

About Blaser Group

The Blaser Group is the official U.S. importer for iconic German firearms brands Blaser, Mauser and J.P. Sauer; English gunmaker John Rigby & Co.; Minox optics and Liemke Thermal Optics. Established in 2006, the company which is based in San Antonio, Texas works with distributors, wholesalers, and over 200 authorized Blaser Group dealers across all North American states, with this figure continually growing. Today the Blaser Group’s industry-leading product portfolio includes bolt-action, combination rifles and over-and-under shotguns designed specifically for game hunters and competitive target shooters. Its custom shop offers exclusive engravings, design work and custom finishing for bespoke guns. With recent innovations, Blaser Group has gone on to expand its product portfolio into cutting-edge optics and accessory lines. For more information about the company and product lines, visit:

Are you in the market for a thermal monocular, or do you already have one?

Eric B
Eric B

Ex-Arctic Ranger. Competitive practical shooter and hunter with a European focus. Always ready to increase my collection of modern semi-automatics, optics, thermals and suppressors. TCCC Certified. Occasionaly seen in a 6x6 Bug Out Vehicle, always with a big smile.

More by Eric B

Join the conversation