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 Nightfox Arctic
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.
Nightfox's head-mountable 1x thermal monocular: 256×192 at 30 mK, a 7 mm fixed-focus lens with a 24° field of view, 50 Hz, video recording, 9-hour 18650 cell.
£349.99cheapest tracked listing
Specification side by side
| Guide TK431 | Nightfox Arctic | |
|---|---|---|
| Technology | Thermal | Thermal |
| Sensor | 400×300 | 256×192 |
| Pixel pitch | 17 µm | 12 µm |
| NETD | ≤30 mK | ≤30 mK |
| Lens | 35 mm | 7 mm |
| Field of view | 11.1° | 23.8° |
| Display | FLCOS 1280x960 | AMOLED 410x502 |
| Recording | photo and video | photo and video |
| Wi-Fi / app | yes | — |
| Battery life | up to 5 h | up to 9 h |
| Battery | removable 18650 Li-ion | removable 18650 Li-ion 3500 mAh |
| Weight | 485 g | 280 g |
| Launched | 2022 | — |
| Magnification | — | 1–4x |
| Digital zoom | — | up to 4x |
| Detection range | — | 180 m |
| Recognition range | — | 100 m |
| Water resistance | — | IP65 |
| Launch RRP | — | £349.99 |
Sources: Guide TK431 (spec page); Nightfox Arctic (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 · Nightfox Arctic · 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