Dual Speed Machines
Dual speed floor buffers are good all-purpose machines. The lower speeds can be used for tough lower-speed scrubbing jobs while the higher speeds can be used for lighter scrubbing jobs. The higher speed settings can occasionally be used for light floor buffing, although not their primary use.
Trusted Clean 17" Dual Speed (180/320 RPM) Floor Buffing Machine - #BK-17VS-TC
Viper 185/330 RPM Dual Speed Floor Scrubbing Machine - 20" Model