What does the T0941-0001 model display on its dial, and does it require batteries?

The Era-Tac Aci Mil-Spec Indicator outputs angle data directly in cosine decimals on a fluid-damped analogue dial. It features a 100% mechanical and gravity-driven mechanism, meaning it requires zero batteries, wiring, or electrical power to operate in the field.

How waterproof and recoil-resistant is the Era-Tac Mil-Spec ACI for harsh Australian alpine conditions?

This Mil-Spec variant is factory-rated waterproof to a depth of 1 metre for up to 35 minutes, easily handling torrential downpours and river crossings. It is also 100% recoil-proof and built to withstand heavy tactical calibres including .338 Lapua Magnum and .50 BMG without losing calibration.

What mounts are needed to attach the standalone T0941-0001 indicator to my rifle setup?

The T0941-0001 is supplied as a standalone unit and is designed to mount directly onto an Era-Tac universal-interface bubble level adapter ring or side mounting adapter. You can pair it with compatible hardware such as the Era-Tac Picatinny Adapter Side Version or Era-Tac Aluminum Scope Rings featuring the Universal Interface.

Are there any electrical compliance or regulatory restrictions for owning this device in Australia?

Because the Era-Tac Mil-Spec ACI is an entirely passive mechanical and optical accessory, electrical compliance items like 240V mains compatibility and SAA or RCM approvals do not apply. It is completely unrestricted for civilian ownership and use across all Australian states and territories.

Angle Cosine Indicator - Era-Tac T0941-0001

The ERA-TAC ACI Mil-Spec Indicator (part number T0941-0001) is a 100% mechanical, gravity-driven analogue instrument engineered to measure extreme incline and decline shooting angles. Manufactured in Germany by Recknagel's tactical division, this angle cosine indicator mounts directly to the rifle optic setup to help shooters correct for gravity's effect on bullet trajectory during high-angle engagements. As the rifle tilts uphill or downhill, a fluid-damped internal drum rotates, allowing a high-visibility red needle to indicate the direct cosine decimal of the angle. Shooters multiply their line-of-sight rangefinder distance by this cosine number to calculate the precise horizontal distance required for elevation turret adjustments.

Key Features

Direct Cosine Readout: Outputs trajectory compensation values purely in cosine decimals, allowing shooters to calculate horizontal distance without converting degrees.
Submersible Mil-Spec Build: Engineered for extreme field conditions, providing factory-rated waterproof protection to a depth of 1 metre for up to 35 minutes.
Heavy Calibre Recoil Proof: Built completely recoil-proof against severe tactical calibres, including magnum platforms up to .338 Lapua Magnum and .50 BMG.
Completely Passive Operation: Utilises a gravity-weighted, fluid-damped internal mechanism that requires zero batteries, wiring, or external power sources.
Offset Aiming Visibility: Positioned to remain clearly visible from behind the rifle, avoiding visual obstruction from large parallax turrets or illumination knobs.

Specifications

Manufacturer: ERA-TAC (Recknagel)
Part Number: T0941-0001
Category: Angle cosine indicator (Mil-Spec)
Output Format: Cosine decimals (e.g. 0.85, 0.90)
Water Resistance: Waterproof to a depth of 1 metre for up to 35 minutes
Calibre Rating: 100% recoil-proof up to .338 Lapua Magnum and .50 BMG
Power Requirements: None (gravity-driven mechanical drum)
Interface Compatibility: Mounts to ERA-TAC bubble level adapter ring/mount (T0940-0001 / Universal-Interface system)

Who is the ERA-TAC ACI Mil-Spec Indicator for?

Alpine hunters — relies on an angle cosine indicator waterproof to a depth of 1 metre for up to 35 minutes, ensuring mechanical reliability and clear trajectory calculation in wet, steep mountain environments.
Long-range marksmen — benefits from an angle cosine indicator that supplies immediate cosine decimal readouts to instantly multiply against line-of-sight yardage or metres without manual angular degree conversion.
Precision rifle competition shooters — requires a mechanical indicator waterproof to a depth of 1 metre for up to 35 minutes that maintains fluid-damped precision under heavy recoil without relying on electronics.

Less suitable for: Dynamic engagements or night operations where manual multiplication causes critical delays, which require digital rangefinders with integrated angle-compensated ballistic engines for immediate firing solutions; or ballistic workflows that require input measured in degrees rather than cosine decimals, which require degree-marked angle indicators such as the ERA-TAC T0941-0002 or T0941-0003.

SKU	ERA42401LP
Model #	T0941-0001
Brand	Era-Tac
Shipping Weight	1.0000kg

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Era Tac T0941 0001 Angle Cosine Indicator Waterproof Mil Spec

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