The Guide TE421 is built for users who want thermal imaging performance without carrying a large or heavy optic. Its compact body is closer in size to a mobile phone than a traditional thermal monocular, making it easier to keep on hand during outdoor trips, wildlife observation, property monitoring, or general low-light scanning.

The 400x300 uncooled VOx sensor works alongside the 25mm F1.0 lens to produce detailed thermal imagery with strong contrast and clear target separation. Detection reaches out to 1300m (1422yd), while the 50Hz refresh rate helps maintain smoother image movement when scanning across terrain or tracking movement.

Guide has kept the controls simple with a one-button and one-ring layout that makes menu navigation and zoom adjustments easier in the field. The 0.32 inch AMOLED display provides sharp viewing performance, while the 25mm eye relief improves comfort during longer observation sessions.

Built-in photo, video, and audio recording gives you the flexibility to document activity directly onto the internal 16GB storage. Dual-band WiFi improves wireless transfer performance, and the integrated rechargeable battery supports fast USB-C charging when power is running low.

For users wanting a lightweight thermal monocular with practical recording features, modern connectivity, and strong image performance in a compact handheld format, the TE421 keeps things portable without stripping away the features that matter most outdoors.

Key Features

• 400x300 Thermal Sensor: Captures detailed thermal imagery with strong clarity and contrast across changing outdoor conditions
• 25mm F1.0 Lens: Balances field of view and long-range detection for scanning open terrain and observation areas
• AMOLED Display: Produces smooth, high-contrast viewing with reduced eye strain during extended use
• Compact Pocket-Sized Design: Lightweight 295g (10.4oz) build is easy to carry in a pack or jacket pocket
• 20W Fast Charging: Delivers around 1 hour of runtime from a quick 10-minute charge
• Built-In Recording: Stores photos, video, and audio directly to the integrated 16GB memory
• Dual-Band WiFi: Supports faster wireless transfer speeds and stronger device connectivity
• IP67 Protection: Designed to handle wet weather, dust exposure, and demanding outdoor conditions