Guide TB420

The Guide TB420 is a robust thermal clip-on designed for versatile field use. Featuring a 400×300 VOx thermal sensor with a 12 µm pixel pitch and a highly sensitive NETD of ≤ 25 mK, it delivers sharp and detailed thermal imagery in all lighting conditions. The clip-on mounts seamlessly in front of day optics to extend their use into the night—without affecting the zero of your scope.

Its 25 mm f/1.0 lens offers a wide field of view of 19 m × 14 m at 100 m and supports 1× optical magnification, ideal for maintaining situational awareness through your primary optic. The 0.39" AMOLED display with full HD 1920×1080 resolution ensures vivid, clear visuals even during fast panning or zooming. Dual-band Wi‑Fi, built-in microphone, and Bluetooth expand functionality for advanced users.

About the Guide TB Series

The Guide TB series is purpose-built for users who need the flexibility of both daytime optics and thermal vision in one platform. With excellent sensor sensitivity, long battery runtime, photo/video/audio capture, and rugged waterproof construction, TB models deliver high-performance night vision in a clip-on form factor.

Key Features

• 400×300 VOx sensor with 12 µm pixel pitch
• NETD ≤ 25 mK for excellent detail in fog, rain, or darkness
• 25 mm f/1.0 objective lens with manual focus
• Field of view at 100 m: approx. 19 m × 14 m
• 1× optical magnification for use through day optics
• Detection range: up to 1300 m
• Display: 0.39″ AMOLED, 1920×1080 resolution
• Color palettes: White Hot, Black Hot, Red Hot, Green Hot, Iron Red, Blue Hot, Sepia
• 8.9× digital zoom through eyepiece
• Audio/video/photo recording with 32 GB internal memory
• Connectivity: 2.4 G & 5 G Wi‑Fi, Bluetooth, USB‑C
• Power: 2× replaceable 18650 batteries, up to 12 h runtime
• Housing: IP68 waterproof, shockproof (1000 g @ 1 ms)
• Weight: 420 g; Dimensions: 128 × 79 × 79 mm

About Guide Sensmart

Guide Sensmart is a globally recognized manufacturer of thermal imaging devices with over 20 years of expertise. Serving more than 70 countries, Guide develops advanced thermal technologies for hunting, outdoor, security, and industrial applications.

What’s in the Box

• Guide TB420 Thermal Clip-On Device
• 2× 18650 Rechargeable Batteries
• Battery Charger
• 5V/2A Power Adapter (EU, UK, US, AU)
• USB Type-C Cable
• Quick Start Guide & Warranty Card

Warranty

The TB420 is backed by a 2‑year manufacturer warranty and supported through Guide's global network of certified service partners.