The Saphir 550 with Rubin 540 is a single wheel grinder and polisher for working wheels Ø 200–300 mm. The especially strong, speed controlled drive allows the strongest pressures. The clearly arranged and robust menu display enables user friendly operation. The parallel grinding unit of the Rubin 540 moves the exposed sample holder in clockwise/anticlockwise rotation with variable speed across the working area. Pressing down the samples just by their own weight ensures a gentle preparation of pressure-sensitive and delicate specimen. The shock-resistant plastic basin, powder coated Aluminium housing and high standard of technology inside the unit lend the requisites for quiet and smooth running.