(1) By power source: pneumatic and electric. The source describes pneumatic tools as comparatively safe but dependent on compressed air. Electric tools require appropriate electrical safety precautions.
(2) By function: industrial dual-purpose sanding/polishing tools and simple polishing tools. Dual-purpose tools accept grinding wheels for metalwork or polishing pads for automotive paint care. The source describes a weight of 2-3 kg, stable operation and adjustable speed for professional use. Simple tools are described as drill-based, compact, fixed-speed devices that are harder to balance and less commonly used by professional detailers.
(3) By speed: high-, medium- and low-speed polishing machines. The archived source gives 1,750-3,000 for high speed, 1,200-1,600 for medium speed and 1,200 r/min for low speed. High and medium speeds are adjustable; low speed is fixed. The first two rotational-speed units are garbled in the source and require verification.