Does the GPO GPOTAC Mono 10x42 HD require any batteries for the integrated reticle?

No, the GPOTAC TM100 is a purely passive optical device and does not require batteries, electronics, or a power source of any kind. As a result, standard electrical regulations like SAA/RCM certifications and 240V mains compatibility are not applicable to this product.

Can I mount this monocular directly onto a firearm rifle rail?

No, the TM100 is designed strictly as a handheld and belt-clipped spotting device featuring an integrated steel utility belt and pocket clip with an included Cordura case. It does not feature a Picatinny or weapon-mount interface and is not rated to withstand direct firearm recoil.

How does the reticle assist with target ranging in the field?

The monocular features an off-center mil-radian (MIL/MRAD) reticle built specifically for swift target measurement and impact spotting without obstructing the center viewing axis. It provides quick estimations across tactical and sporting distances up to 1,000 metres, though active laser rangefinders or higher magnification spotting scopes like the GPO Passion APO 16-48x65 are recommended for extreme long-range needs.

What gear pairs well with the GPOTAC Mono 10x42 HD for carrying in the outback?

At a lightweight 13.4 oz (380 g), it is optimized for rapid one-handed deployment and comes with a Cordura case and strap. For users looking to integrate it into an existing harness setup during multi-day backcountry hunts, it pairs exceptionally well with compatible gear such as the GPO Bino Harness Pro.

Tactical Monocular - GPO TM100

The GPO GPOTAC Mono 10x42 HD (Model: TM100) is a compact tactical monocular engineered for handheld observation, target measurement, and impact spotting. Built with extra-low dispersion (ED/HD) glass, proprietary GPObright™ multi-coatings, and a BAK4 prism, the optic achieves 90% light transmission through a 42 mm objective lens. Housed in a rugged, rubber-armoured magnesium alloy chassis, it features an integrated steel utility belt clip and an off-center mil-radian (MRAD) reticle designed to allow clear target ranging without obstructing the central sight picture.

Key Features

Off-Center MIL Reticle: Incorporates an offset mil-radian reticle for precise range estimation and target measurement while keeping the central optical axis clear.
High-Transmission Optical System: Delivers 90% light transmission using 42 mm HD objective lenses, BAK4 prisms, and GPObright™ lens coatings.
One-Handed Operation: Designed for rapid single-handed deployment with a smooth focus mechanism and an integrated steel carry clip.
Tactical Durability: Nitrogen-purged, fog-proof, and fully waterproof up to a depth of 1 metre.

Technical Specifications

Magnification: 10x
Objective Lens Diameter: 42 mm
Field of View: 304 ft at 1,000 yards (101 m at 1,000 m)
Eye Relief: 14 mm
Light Transmission: 90%
Weight: 13.4 oz (approx. 380 g)
Dimensions: 2.2 in (H) × 2.2 in (W) × 5.3 to 6.3 in (L) (56 mm × 56 mm × 135–160 mm)
Body Material: Rubber-armoured magnesium alloy
Submersion Rating: Waterproof up to 1 metre

Who is the GPO GPOTAC Mono 10x42 HD for?

Long-range precision shooters — provides 10x magnification paired with an off-center MIL reticle to spot bullet impacts and calculate target holdovers across a 304 ft at 1,000 yards field of view without carrying full-size spotting gear.
Bowhunters — offers passive range estimation and optical clarity through a 42 mm objective lens while keeping pack weight down to 13.4 oz (380 g) for rapid, single-handed glassing in the field.
Tactical law enforcement personnel — delivers 90% light transmission in low-light environments inside a compact 13.4 oz waterproof tactical monocular equipped with an integrated steel belt clip for chest-rig or duty-belt carry.

Less suitable for: Long-range target resolution beyond standard 10x magnification limits, where high-magnification spotting scopes (20–60x) or active laser rangefinders are better suited, or for prolonged all-day glassing sessions where dual-ocular stereoscopic binoculars prevent single-eye fatigue.

SKU	GPO40620LP
Model #	TM100
Brand	Gpo
Shipping Weight	1.0000kg

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Gpo Tm100 Gpotac Tactical Monocular 10x42 Hd

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