The Guide TE421 400×300 thermal imaging monocular (brand part no. TE421) is a handheld thermal viewer from the Guide TE series of pocket-size infrared monoculars. It is built for scanning in darkness, smoke or haze, where an ordinary optic gives you nothing to see. Controls are kept simple, with a zoom ring on the body and a function knob for moving through the menu. A wrist strap and USB-C cable come in the box, so it is ready to charge and carry right away.

Key Specifications

• The sensor resolution is 400×300, as the model name states, for a detailed thermal picture.
• A zoom ring on the body adjusts the focal length without taking your eye from the eyepiece.
• A sight distance adjustment at the eyepiece sets the focus for your own eye.
• Charging is by USB-C, and the included cable lets you power it from common chargers and power banks.
• A Picatinny hole and a triangular holder interface give you ways to mount the monocular on external accessories.
• A built-in microphone captures audio with recordings.

Frequently Asked Questions

What comes in the box? The TE series package lists the device, a USB-C cable, a wrist strap, a safety information sheet, operation guidance and a warranty card.

How do you charge it? It charges through its USB-C data interface, which also handles data transmission.

Can it be mounted? Yes. The body has a Picatinny hole for an external Picatinny mount and a triangular holder interface for connecting a triangle mount.

Buy the Guide TE421 400×300 Thermal Imaging Monocular

A thermal monocular earns its place on any property or hunt where you need to find heat signatures at night. Order the TE421 from our Lubbock, Texas shop for fast, insured shipping, and browse more thermal sights while you are here.