Guide's TrackIR-series 400×300 thermal monocular with a 35 mm F1.2 lens, 1280×960 display and a swappable 18650 cell. Discontinued.
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Guide TK431 vs Liemke Keiler 25.1
Two thermal monoculars compared on the makers' own figures. Rows in bold are where they differ; a dash means that maker does not publish the figure.
Liemke's compact 384×288 thermal with a 25 mm F1.0 lens, 10.5° field of view, 32 GB memory, IP67 body and a removable pack rated at 10 hours.
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Specification side by side
| Guide TK431 | Liemke Keiler 25.1 | |
|---|---|---|
| Technology | Thermal | Thermal |
| Sensor | 400×300 | 384×288 |
| Pixel pitch | 17 µm | 12 µm |
| NETD | ≤30 mK | ≤40 mK |
| Lens | 35 mm | 25 mm |
| Field of view | 11.1° | 10.5° |
| Display | FLCOS 1280x960 | OLED 1024x768 |
| Recording | photo and video | photo and video |
| Wi-Fi / app | yes | yes |
| Battery life | up to 5 h | up to 10 h |
| Battery | removable 18650 Li-ion | removable Liemke BP-K Li-ion pack |
| Weight | 485 g | 445 g |
| Launched | 2022 | — |
| Magnification | — | 2.4–24x |
| Digital zoom | — | up to 10x |
| Detection range | — | 1,250 m |
| Water resistance | — | IP67 |
Sources: Guide TK431 (spec page); Liemke Keiler 25.1 (spec page). Detection ranges are for a 1.8 m object under each maker's own test conditions and are not directly comparable between brands.
Full pages: Guide TK431 · Liemke Keiler 25.1 · all thermal monoculars in stock today
Specifications are the manufacturers' published figures. Prices are Amazon.co.uk at our last daily check. As an Amazon Associate we earn from qualifying purchases. More