Guide TD633 Thermal Monocular

The Guide TD633 takes the same 640 × 512 12μm thermal sensor and 35mm F1.0 lens platform as the TD633L LRF model — without the integrated rangefinder, at a $200 lower price. For hunters who already carry a dedicated rangefinder or don't need on-target ranging, the TD633 delivers identical core thermal performance: 20 mK NETD, 50 Hz refresh, 1,950-yard detection, and a 10-hour runtime on a single replaceable 18650 cell. At $1,799 it sits in the same tier as the Pulsar Helion 2 XQ38 and AGM Asp-Micro TM-256, but with a finer 12 μm pixel pitch and Guide's 10-year US warranty.

Key Features

• 640 × 512 @ 12 μm sensor with 20 mK NETD — full 50 Hz refresh; finer pixel pitch than 17 μm 384-class entry monoculars
• 35 mm F1.0 germanium lens with 2.0x – 16x magnification — wide native FOV for scanning, 8× digital zoom for distant ID
• 1,800 m / 1,950 yd man-target detection — covers the long-range observation envelope from a handheld form factor
• 0.36" 1280 × 960 AMOLED display, 20 mm eye relief — sharper than the 800×600 displays common at this tier
• Replaceable 18650 battery, 10-hour runtime — commodity cells (carry spares from any reputable vendor); no proprietary pack
• WiFi (2.4G + 5G) + Bluetooth + 32 GB internal storage — onboard photo/video recording with audio for shot review
• Seven image palettes — White Hot, Black Hot, Red Hot, Green Hot, Iron Red, Blue Hot, Sepia
• IP67 weather sealing — rain, dew, and dust ingress rated
• 376 g / 13.26 oz — pocketable handheld form factor for stand hunters and stalkers
• ±6 diopter adjustment — per-eye prescription compensation

How It Compares

• vs Guide TD633L (in-store sibling at $1,999): same sensor, lens, chassis, and battery — the L variant adds a built-in 1,000-yard laser rangefinder. Pick the TD633 if you already carry a dedicated rangefinder or don't need on-target ranging; pick the TD633L if you want both functions in one device.
• vs Pulsar Helion 2 XQ38 (~$2,200–$2,500): comparable 384-class Pulsar with 17 μm pixel pitch; TD633 brings 640-class resolution at lower price.
• vs AGM Asp-Micro TM-256 (~$700–$900): much cheaper but uses 256×192 sensor — meaningfully lower resolution. TD633 is a category up.

Ideal For

• Predator and big-game hunters running stand and stalk setups — the 35 mm lens covers most observation distances; the 1,950-yard detection lets you confirm activity well before commitment
• Hunters who already own a dedicated rangefinder — saves the cost of duplicate ranging hardware vs the TD633L
• Stand hunters running long sits — 10-hour runtime on a replaceable 18650 covers a full setup-to-pull-out window
• Buyers stepping up from 256-class entry thermal — the resolution and detail jump from 256 × 192 to 640 × 512 is the largest single capability upgrade in the thermal monocular tree

Accessories & Compatibility

• Ships with dust-free cloth, hand strap, eye mask, 18650 battery + charger, 5V 2A power adapter, USB-A to USB-C cable, quick start guide, and warranty card
• 10-year manufacturer warranty backed by Guide's US-based repair center in Texas