Radical Instruments offer Automatic Knife Sharpener. Radical Instruments is an ISO: 9001 certified manufacturer of biological and industrial microscopes. The Automatic Knife Sharpener is a portable and precise automatic microtome knife sharpening equipment for fine sharpening of all microtome knives up to 140 mm in length. Its sharpening duration can be adjusted with timer from 0-60 minutes. The Automatic Knife Sharpener is supplied with the accessories like universal knife holder, honing glass plates, honing glass compound, knife inspection block, redressing pad and operating manual. The microscope, with its rack and pinion attachment is mounted on a vertical slide and is free to rotate in vertical plane.