The GPO Rangeguide 3200 8x40 (SKU: BX732) is a compact laser rangefinding binocular combining Double HD glass optics with a built-in Class 1 (905 nm) laser engine. Designed to eliminate the need to carry separate observation optics and rangefinders, it delivers distance measurements in approximately 0.25 seconds with a scan rate of 3 to 4 readings per second. The unit measures reflective targets at distances up to 3,200 m (3,500 yd) and features internal sensors that record line-of-sight distance, true horizontal range (angle compensation), ambient temperature, humidity, and barometric pressure, displaying data via an internal red OLED display with nine manual brightness levels and auto-ambient brightness control.

Key Features

• Optical Construction: Schmidt-Pechan prism system with Double HD glass, GPObright anti-reflective coatings, and PASSIONdrop water-repellent exterior coatings.
• Target Ranging Modes: Includes "Best" and "Last" target discrimination modes to filter background clutter and brush.
• Environmental Sensors: On-board calculation of air pressure, temperature, humidity, and true horizontal angle-compensated distance.
• Ruggedised Chassis: Nitrogen-purged magnesium body encased in rubber armour, waterproof rated up to 100 mbar.
• Power Supply: Operates entirely off a single disposable 3V CR2 lithium battery without requiring mains charging.

Specifications

• Magnification: 8x
• Objective Lens Diameter: 40 mm
• Exit Pupil: 5.0 mm
• Eye Relief: 17–18 mm
• Linear Field of View: 135 m at 1,000 m (375 ft at 1,000 yd)
• Close Focus: ~5 m (16 ft)
• Maximum Reflective Range: Up to 3,200 m (3,500 yd)
• Tree/Soft Target Range: Up to 1,000 m
• Game Animal Range: Up to 700 m
• Minimum Ranging Distance: ~5 m
• Dimensions: 137 mm (L) × 136 mm (W) × 58 mm (H)
• Weight: 747 g (without battery)
• Mounting: Standard front hinge tripod adapter screw thread

Who is the GPO Rangeguide 3200 8x40 for?

• High-country and alpine stalkers — Requires a lightweight 747 g laser rangefinding binocular with compact 137 mm × 136 mm × 58 mm chassis dimensions to minimise pack weight during all-day vertical ascents without sacrificing optical clarity.
• Long-range precision field hunters — Relies on a 3,200 m reflective ranging engine paired with an 8x magnification optical system to calculate true horizontal range, barometric pressure, humidity, and temperature data directly from a single handheld unit.

Less suitable for: Hunters attempting to range deer-sized game animals beyond 700 m or users who exclusively glass stationary targets across vast open terrain, where higher-magnification 10x or 12x optics with larger 50 mm or 56 mm objective lenses provide superior resolution at extreme distances.