- Same ruling as Neubauer improved, but with Rhodium-coated chamber bottom. Rulings are engraved into the Rhodium layer and appear bright under normal microscope settings. By altering the contrast, the microscope image can be reversed resulting in the rulings appearing brighter or darker, as required. - Without spring clips. - Chamber depth: 0.1 mm. - Same ruling as Neubauer improved, but with Rhodium-coated chamber bottom. Rulings are engraved into the Rhodium layer and appear bright under normal microscope settings. By altering the contrast, the microscope image can be reversed resulting in the rulings appearing brighter or darker, as required. - Without spring clips. - Chamber depth: 0.1 mm.