The TD635LS is powered by Guide’s complete ApexVision S1 system architecture, combining the ApexCore S1 detector, Nexus 1.0 processing platform and Hyper-Light 2.0 imaging algorithm.

Together with its high-resolution 640 × 512 @ 12 μm detector and 15 mK NETD, the system helps reveal subtle temperature differences while enhancing image definition, contrast and fine thermal detail.

A smooth 50 Hz frame rate keeps movement clear and responsive, helping users follow moving people, wildlife or vehicles with greater confidence.

The TD635LS combines high-resolution thermal detection and accurate distance measurement in one compact handheld device.

Its 35 mm F1.0 objective lens provides a detection range of up to 1,800 metres, with a wide 12.5° × 9.4° field of view and magnification ranging from 2.03× to 16.24×.

The integrated laser rangefinder measures target distances at up to 1,200 metres, helping users assess the location of distant heat signatures without switching between separate thermal and ranging devices.

The TD635LS features a symmetrical ergonomic housing designed for comfortable operation with either the left or right hand.

Its rear focusing roller allows users to make fast and precise focus adjustments with one finger, while the streamlined control layout keeps essential functions within easy reach.

Manual focusing allows the image to be adjusted for subjects at different distances, while the balanced 465 g body supports stable handheld observation during longer field sessions. The manufacturer describes the TD Gen3 LRF design as ambidextrous and optimised for one-handed use.

The TD635LS features a 0.49-inch AMOLED display with a 1440 × 1080 resolution, presenting high-resolution thermal imagery with strong contrast and clear target detail.

The eyepiece provides 20 mm eye relief, dioptre adjustment from −6 to +6 and 13.8× eyepiece zoom, supporting comfortable observation for different users.

Seven thermal colour palettes allow the display to be adapted according to the subject, surrounding conditions and user preference:

White Hot, Black Hot, Red Hot, Green Hot, Iron Red, Blue Hot and Sepia.

A single replaceable 18650 battery provides the TD635LS with up to ten hours of operating time, supporting extended observation without relying on a permanently installed internal battery.

The battery can be replaced in the field when additional operating time is required. Its installation system is designed to remain practical in darkness, helping users continue operating without unnecessary interruption.

The standard package includes two 18650 batteries and a battery charger, allowing one battery to be prepared while the other powers the monocular.

The TD635LS supports thermal photography and video recording with synchronised audio, allowing users to document observations directly through the monocular.

A built-in microphone records audio alongside video, while 64 GB of internal storage provides space for thermal photographs, recordings and operational documentation.

Captured content can be retained for later review or transferred to a compatible device, supporting security observation, search and rescue, wildlife monitoring and professional field reporting.

The TD635LS supports both 2.4 GHz and 5 GHz Wi-Fi, providing flexible wireless connectivity for transferring captured photographs and videos.

Compatible TargetIR application connectivity supports wireless device functions and over-the-air firmware updates, helping users keep the monocular’s software current.

Bluetooth connectivity supports compatible wireless accessories, while the USB-C interface provides external power and USB 2.0 data transfer.

The TD635LS combines a high-resolution thermal detector and integrated laser rangefinder within a compact body measuring 201 × 67 × 88 mm and weighing 465 g.

Its IP67 protection rating helps protect the device against dust and water exposure, while an operating-temperature range of −20°C to 50°C supports use across demanding environments.

This combination of portability, durability, high-resolution imaging and extended operating time makes the TD635LS well suited to professional security, search and rescue, wildlife monitoring and long-range field observation.