Product Description The ARO Shaker™ is a precision-engineered espresso grounds agitator that breaks up clumps formed during grinding, helping fine and coarse particles mix evenly to support consistent water flow through the puck. Coffee grounds do not exit the grinder uniformly. Static, burr geometry, and grind path create clumps and density variations that carry directly into the basket. Adding a simple shaking step before dosing into the basket helps separate and aerate the grounds, creating a more consistent starting point for distribution and tamping. This reduces the amount of correction needed later in the workflow and makes puck preparation more forgiving and repeatable. Built as part of the ARO PortaStack system, the Shaker docks securely to the ARO PortaFunnel™ – PortaStack Edition for a controlled, spill-resistant workflow, while also functioning directly on a portafilter basket. Unlike generic shakers that sit too close to the basket and create mess, the ARO Shaker is designed with an elevated drop height. When stacked on the PortaFunnel, it positions the grounds approximately 16mm above the top of the basket, allowing grounds to fall and redistribute more evenly while eliminating spills. Key Features PortaStack-Compatible Magnetic Docking System: The base of the shaker incorporates six custom arc magnets that align and attach to the steel docking ring in the ARO PortaFunnel – PortaStack Edition. The connection is secure and stable, enabling controlled one-handed operation. Magnetically Secured Cap: The cap magnetically interfaces with the shaker body using the same arc magnet and steel target architecture as the PortaStack docking system. This magnetic connection helps keep the shaker spill-resistant during handling and workflow transitions. Hold the cap in place during shaking! Adjustable-Polarity Magnetic Plug: The plug unscrews into two halves to access a spring-retained magnet that can be flipped to change magnetic polarity. This allows compatibility with existing shaker landing zones, such as grinders or dosing stands with magnetic targets. The magnet can also be removed entirely when no magnetic attraction is desired. Intentional Magnetic Hierarchy: The magnetic strength between the shaker body and funnel is stronger than the cap-to-body connection. When removing the lid and plug, the shaker body remains securely attached to the funnel for an efficient workflow. Elevated Drop Height for Even Distribution: When stacked on the PortaFunnel, the shaker sits approximately 16 mm above the top of the basket. This added drop height allows grounds to flow more freely as they enter the basket, promoting a more even distribution. Dual-Use Base Design: The contoured base includes a seating lip that allows the shaker to rest directly on a portafilter basket without a PortaFunnel, enabling use as a standalone shaker or within any preferred workflow. Premium Aluminum Construction: Crafted from precision-machined aluminum, all components are anodized for a durable, scratch-resistant finish. A satin exterior helps hide fingerprints and smudges, while polished interior surfaces and the polished plug reduce grounds sticking and simplify cleaning. Like all ARO tools, it’s built for long-term use and premium feel. Usage Instructions The ARO Shaker is designed to work as part of the PortaStack system or as a standalone tool on a portafilter basket. Follow the steps below for a controlled, spill-resistant workflow. Dose: Remove the cap and leave the plug in place. Grind directly into the shaker. Shake: Replace the cap. Hold the shaker body with one hand and use one or two fingers to hold the cap in place. Shake vigorously for 4–8 seconds. Dock: Set the shaker onto the ARO PortaFunnel – PortaStack Edition, or place it directly on top of your portafilter basket. Release Grounds: Remove the cap, lift the plug to drop the grounds, then rotate the plug handle and gently knock the bell-shaped bottom against the interior walls of the shak