Guide TD435LS Handheld Thermal Imaging Monocular

GUIDE TD435LS HANDHELD THERMAL IMAGING MONOCULAR Compact Design. Precise Thermal Ranging. Experience clear, responsive thermal observation with the Guide TD435LS. Built around a high-sensitivity 400 × 300 @ 12 μm infrared detector, 15 mK thermal sensitivity and Guide’s complete ApexVision S1 imaging architecture, it delivers detailed thermal imagery in complete darkness and low-contrast conditions. Its 35 mm F1.0 objective lens provides a detection range of up to 1,800 metres, while magnification from 3.26× to 13.04× allows users to examine distant heat signatures in greater detail. An integrated 1,200-metre laser rangefinder provides fast and convenient target-distance measurement directly through the monocular. The TD435LS features a symmetrical ergonomic body and rear focusing roller designed for comfortable one-handed operation with either hand. A 0.49-inch 1440 × 1080 AMOLED display, 64 GB of internal storage, dual-band Wi-Fi, Bluetooth and photo and video recording with audio complete this highly capable thermal observation system. A replaceable 18650 battery provides up to ten hours of operation, while the IP67-rated enclosure helps protect the monocular against dust, water and demanding outdoor conditions. Get a Quote GUIDE TD435LS KEY FEATURES Clear Thermal Detail at Long Range The TD435LS combines a 400 × 300 @ 12 μm thermal detector, 15 mK thermal sensitivity and a smooth 50 Hz frame rate. Its 35 mm F1.0 lens provides detection up to 1,800 metres, supporting detailed thermal observation across open terrain and low-contrast environments. Integrated Precision Laser Ranging A built-in 1,200-metre laser rangefinder provides convenient target-distance measurement directly through the monocular. Its integrated design adds accurate ranging capability without compromising the TD435LS’s compact handheld format. Built for Extended Field Operation The TD435LS combines one-handed focusing, ambidextrous controls, a replaceable 18650 battery and up to ten hours of operation. IP67 protection, 64 GB storage and dual-band Wi-Fi support dependable use and efficient field documentation. APEXVISION CLARITY IN EVERY DETAIL The TD435LS 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-sensitivity 400 × 300 @ 12 μm detector and 15 mK NETD, the system helps reveal subtle temperature differences while improving 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 more confidently. LONG-RANGE DETECTION WITH PRECISE RANGING The TD435LS combines long-range thermal detection and accurate distance measurement within one compact handheld device. Its 35 mm F1.0 objective lens provides a detection range of up to 1,800 metres, with a field of view of 7.9° × 5.9° and magnification ranging from 3.26× to 13.04×. 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. ONE-HANDED FOCUSING AND AMBIDEXTROUS CONTROL The TD435LS 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 thermal image to be adjusted for subjects at different distances, while the compact 374 g body helps reduce fatigue during longer observation sessions. EXTENDED POWER WITH A REPLACEABLE BATTERY A single replaceable 18650 battery provides the TD435LS with up to ten hours of operating time, supporting extended observation without relying on a permanently installed internal battery. The removable battery can be replaced in the field when additional operating time is required. Its installation system is designed to remain practical when operating in darkness. The standard package includes two 18650 batteries and a battery charger, allowing one battery to be prepared while the other powers the monocular. CAPTURE PHOTOS, VIDEO AND AUDIO The TD435LS supports thermal photography and video recording with synchronised audio, allowing users to document observations directly through the monocular. A built-in microphone captures 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, making the TD435LS useful for security observation, search and rescue, wildlife monitoring and field reporting. DUAL-BAND WI-FI AND TARGETIR CONNECTIVITY The TD435LS 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 software updates, helping users keep the monocular’s firmware current. Bluetooth connectivity also supports compatible wireless accessories, while the USB-C interface provides external power and USB 2.0 data transfer. Sensor Core technology Full ApexVision S1 system architecture: ApexCore S1 detector + Nexus 1.0 platform + Hyper-Light 2.0 algorithm Detector type Uncooled VOx infrared detector, 8 to 14 μm Resolution 400 × 300 @ 12 μm NETD 15 mK Frame rate 50 Hz Lens Objective lens 35 mm, F1.0 Field of view 7.9° × 5.9° FOV m@100m 14 × 10 m Magnification 3.26× to 13.04× Detection range 1,800 m / 1,950 yd Focus Manual Display Display type 0.49-inch AMOLED Display resolution 1440 × 1080 Colour palettes White Hot, Black Hot, Red Hot, Green Hot, Iron Red, Blue Hot and Sepia Eye relief 20 mm Dioptre adjustment −6 to +6 Eyepiece zoom 13.8× Hardware Laser rangefinder 1,200 m / 1,300 yd Wi-Fi 2.4 GHz and 5 GHz Interface USB-C for external power and USB 2.0 Microphone Built in Bluetooth Yes System Recording function Photo and video recording, with audio included Memory capacity 64 GB Power Battery type Single replaceable 18650 battery Operating time Up to 10 hours Batteries supplied Two 18650 batteries Environmental Operating temp. −20°C to 50°C / −4°F to +122°F Encapsulation IP67 Physical Weight (g/oz) 374 g / 13.19 oz Size (mm/in) 171 × 54 × 74 mm / 6.73 × 2.13 × 2.91 in UPGRADE YOUR THERMAL VISION Combine clear thermal imaging, long-range detection and precise laser ranging with the compact Guide TD435LS. DOWNLOADS AND SUPPORT Guide Outdoor Products 2026 Brochure Guide TD435LS Datasheet Get a Quote Please complete the form below to submit your quote request.