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 pairs a finer 12 μm pixel pitch with Guide's 5-year US warranty (10 years on the thermal sensor).

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.

Comparing models? See where the TD633 fits in the full Guide Sensmart thermal range, or browse our other thermal monoculars.

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
• 5-year manufacturer warranty (10 years on the thermal sensor) backed by Guide's US-based repair center in Texas