The TwinPrep 5™ grinding/polishing machine is recommended for manual sample preparation of a wide variety of materials. Dual, powerful ½ HP (375 W) DC motors provide constant high-torque output throughout the RPM range, digitally displayed from 10-500. Platens rotate independently, and either 8" (203 mm) or 10" (254 mm) aluminum or magnetic platens can be used. The stable, corrosion-resistant aluminum and stainless steel construction ensures maximum durability.