Vintage German mechanical hand dynamometer (R20 type) dating from the 1950s–1960s. This unusual scientific measuring instrument was designed to measure hand force in kilograms and features a secondary scale indicating deformation in millimetres (Dehnung mm). The instrument is manufactured from chrome-plated metal and is presented in its original black fitted case with velvet lining and decorative brass hardware. The precise manufacturer is unknown, as the instrument bears no visible maker's mark, but it closely resembles German hand dynamometers and scientific force testers of the period. The clean dial, precision engineering and elegant industrial design make this piece appealing to collectors of scientific instruments, medical and rehabilitation equipment, and vintage measuring devices. Condition: Good vintage condition with light signs of age and use. The dial remains clean and legible, and the chrome surfaces retain an attractive shine. The original case is included and shows minor wear and a small crack to one corner. Dimensions (case): approximately 13.4 × 7 cm Weight: approximately 560 g The item will be carefully packed and shipped with tracking and insurance.