How does the Flagmaster 1800 perform in extreme Australian outback heat or rainy conditions?

The unit is built to withstand operating temperatures ranging from -10°C to +55°C, making it reliable for hot Australian conditions. It features an IPX4 splashproof and rainproof rating, meaning it handles sudden downpours on the course or in the field easily, though it is not designed for full submersion.

What is the minimum measuring distance and maximum reflective range for the Flagmaster 1800?

The rangefinder has a minimum operating distance of 6 metres, meaning targets closer than this fall outside its capability. On the upper end, it can achieve a maximum reflective range of up to 1,800 metres and reliably ping standard golf flagsticks past 500 metres with an accuracy of plus or minus 1 metre under 100 metres.

Are there any Australian electrical or laser compliance certifications required for this unit?

Because the Flagmaster 1800 operates exclusively on an internal, user-replaceable CR2 3V lithium battery without 240V AC connectivity, Australian mains compliance and SAA approvals are not applicable. For safety, it utilizes a Class 1M eye-safe infrared laser, ensuring it is certified safe for consumer recreational use across Australia.

Laser Rangefinder - GPO GLRF1800

The GPO Flagmaster 1800 6x20 Laser Rangefinder is a compact optical measurement tool engineered for golf and general outdoor distance acquisition. Featuring 6x magnification with a 20 mm objective lens, it delivers clear line-of-sight targeting through a roof prism optical system treated with GPObright high-transmission multi-coatings. The unit provides distance readings from a minimum distance of 6 metres up to a maximum reflective range of 1,800 metres (and over 500 metres to standard flagsticks). Equipped with an angle compensation engine operating across a ±60° inclination range, an external flashing LED provides visual verification when slope mode is active for tournament play.

Key Features

Dual Pin Detection & Visual/Tactile Feedback: Combines reticle flash alerts and sensory vibration bursts upon locking onto flagsticks, with or without reflective prisms.
Hyper-Scan Engine: Delivers high-speed measurement cycles of up to 3 scans per second with an approximate response time of 0.33 seconds.
SLOPE & True-Range Technology: Calculates true horizontal distance within ±60° inclination and features an exterior indicator LED for tournament compliance verification.
High Transmission LCD (HCLD): Displays target data clearly across a 7.5° field of view (132 m at 1,000 m).
Compact Weather-Resistant Build: Features an IPX4 splashproof housing powered by a single user-replaceable 3V CR2 lithium cell rated for over 4,000 measurements.

Technical Specifications

Magnification: 6x
Objective Lens Aperture: 20 mm (effective 20 × 13 mm)
Measurement Range: 6 m to 1,800 m (reflective); 500+ m (flagstick)
Measurement Accuracy: ±1 m under 100 m; <0.5% beyond 500 m
Field of View: 7.5° (132 m at 1,000 m)
Eye Relief: 16–16.5 mm
Exit Pupil: 3.3–3.4 mm
Diopter Adjustment: ±3 dpt
Laser Classification: Class 1 / Class 1M eye-safe infrared
Operating Temperature: -10°C to +55°C
Dimensions: 94 mm (L) × 75.7–76 mm (H) × 33.8 mm (W)
Weight: 147–148 g
Battery Type: 1× CR2 3V Lithium

Who is the GPO Flagmaster 1800 6x20 for?

Tournament and Recreational Golfers — requires slope-compensated distance measurements across a ±60° inclination range with a 500+ metre flagstick detection capability and tactile vibration confirmation in a 147–148 g golf laser rangefinder.
Lightweight Field Scouters — requires rapid distance verification up to an 1,800 metres maximum reflective range with 6x magnification and 3-scan-per-second Hyper-Scan acquisition in an ultra-portable 94 mm monocular housing.

Less suitable for: Targets positioned under 6 metres where the laser cannot resolve readings, marine or extreme wet environments requiring full IPX7/IP67 submersion ratings, or long-range shooting applications requiring integrated ballistic solvers and tripod mounting, which are better served by dedicated ballistic hunting rangefinders.

SKU	GPO40661LP
Model #	GLRF1800
Brand	Gpo
Shipping Weight	1.0000kg

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Gpo Flagmaster 1800 Rangefinder 6x20 Glrf1800 Slope 1800m

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