The Guide TE425S Handheld Thermal Monocular is built for detailed outdoor observation without the bulk of a larger thermal unit. Its 400x300 12um sensor works with a 25mm (0.98 inch) F0.9 objective lens and 50Hz refresh rate, giving you a stated detection range of 1300m (1400yd) and a smooth view when scanning wildlife or changing terrain.

Guide's ApexVision S1 architecture brings the detector, processing platform, and imaging algorithm together as one system. The ApexCore S1 detector, Nexus 1.0 platform, and Hyper-Light 2.0 algorithm are designed to improve image clarity, detail, and motion presentation rather than leaving the thermal sensor to do all of the work on its own. The image is presented through an 8.1mm (0.32 inch) 800x600 AMOLED display, with seven colour palettes available to suit different viewing conditions.

Operation is kept relatively straightforward with a one-button and one-ring control layout. Manual focus lets you adjust the image for different observation distances, while 25mm (0.98 inch) eye relief and -5 to +5 diopter adjustment provide useful eyepiece control.

The TE425S can also capture photos and video with audio, while dual-band 2.4GHz and 5GHz Wi-Fi, Bluetooth, and USB-C connectivity support its recording and wireless functions. The formal source specifications state 64GB of storage, although an earlier section of the supplied copy states 16GB, so the exact storage capacity should be confirmed with the supplier before publishing.

At 320g (11.29oz) and 157x51x47mm (6.18x2.01x1.85 inch), the TE425S keeps this feature set in a compact handheld format. IP67 protection supports outdoor use in changing conditions, and the built-in battery supports 20W charging. Guide states that a 10-minute charge can provide up to one hour of operation, although the supplied source gives conflicting figures of five and six hours for total operating time.

Key Features

• 400x300 12um Thermal Sensor: The uncooled VOx detector combines 400x300 resolution with a 12um pixel pitch and high thermal sensitivity for clearer temperature detail.
• ApexVision S1 Imaging System: Guide combines the ApexCore S1 detector, Nexus 1.0 platform, and Hyper-Light 2.0 algorithm to support image clarity, detail, and smooth thermal viewing.
• 25mm F0.9 Lens: The 25mm (0.98 inch) objective provides a stated 1300m (1400yd) detection range with 1.9x to 7.6x magnification for observation across different distances.
• Smooth 50Hz Viewing: A 50Hz refresh rate works with the 800x600 AMOLED display to provide a smooth view when observing moving subjects or scanning across a scene.
• Compact Handheld Design: At 320g (11.29oz) and 157x51x47mm (6.18x2.01x1.85 inch), the TE425S keeps its thermal imaging system in a relatively compact handheld format.
• 20W Charging Support: A 10-minute charge can provide up to one hour of continuous operation, helping restore useful runtime when charging time is limited.
• Recording And Wireless Connectivity: Photo, video, and audio recording are supported alongside 2.4GHz and 5GHz Wi-Fi, Bluetooth, and USB-C connectivity.