The Guide TE421 packs a 400 × 300 12 μm thermal sensor with 25 mK NETD into a 295-gram pocket-sized chassis — a compact alternative to the larger TD-series monoculars when you want thermal in your jacket pocket rather than your pack. At $999 it brings 12 μm pixel pitch into the sub-$1,000 tier where most competitors still use 17 μm sensors, with a 25 mm F1.0 lens and wide 11° × 8.2° field of view sized for close-to-mid-range scanning.

Key Features

• 400 × 300 @ 12 μm sensor with 25 mK NETD — finer pixel pitch than 17 μm budget thermal scanners
• 25 mm F1.0 germanium lens with 1.9x – 7.6x magnification — wide native FOV (11° × 8.2°) for fast acquisition; 4× digital zoom to extend reach
• 1,300 m / 1,400 yd man-target detection — longer than typical 25 mm thermal monoculars at this price
• 0.32" 800 × 600 AMOLED display, 25 mm eye relief — the longer eye relief is unusual at this tier and helps with eyeglasses
• Compact 295 g / 11.11 oz body, 47 × 47 × 155 mm — pocketable; doesn't need a dedicated pack space
• WiFi (2.4G + 5G), Bluetooth, 16 GB recording with audio — TargetIR app pairs for media transfer and ballistic profiles
• IP67 weather sealing — rain, dew, dust
• Seven image palettes — White Hot, Black Hot, Red Hot, Green Hot, Iron Red, Blue Hot, Sepia
• Built-in battery, ~6-hour runtime — quick-charge USB-C support; covers a typical morning or evening sit
• ±5 diopter adjustment — per-eye prescription compensation

Ideal For

• Stand and tree-stand hunters who want pocketable thermal — pulls out of a pocket faster than reaching back for a binocular harness
• Close-range predator and varmint hunters working under 200 yards — the wide 11° FOV beats a 35 mm scope's narrower view at typical hunting distances
• Hikers, backpackers, and law-enforcement scanners — light enough for all-day carry without notice
• First-time thermal buyers wanting to dip in under $1,000 — the 12 μm pitch and TargetIR app capabilities approach the experience of $1,500+ tier without the price

Accessories & Compatibility

• Ships with lens cover, eye mask, wrist strap, quick charging adapter, USB-C cable, quick use guide, safety information manual, and warranty card
• TargetIR app pairing for photo/video transfer
• 10-year manufacturer warranty backed by Guide's US-based repair center in Texas