Check the listing for details. Manfrotto 819-1 Small Hydrostatic Arm Mount Joint Holding Arm. Condition: Used, Made in Italy. Listed at 192.98 USD. Item description: The Manfrotto Small Hydrostatic Arm is a professional articulated arm for precisely attaching accessories such as monitors, LED lights or flash units to cameras. The standout feature of this model is the hydrostatic locking, where an oil-filled chamber distributes pressure evenly across the ball joints, allowing for an extremely firm hold with minimal effort. Unless there is a “DEF” (defect) or “LIN” (lens damage) behind the condition statement, all goods are in technically perfect condition and have been checked by me as far as possible. Defects or damage will also be mentioned separately in the description if they are known. All prices include statutory sales tax, but due to different types of taxation, this cannot always be shown separately on the invoice. For tax cl.