Pen vs machine
Plasma pens, fibroblast pens and plasma machines
Plasma is ionized gas. In aesthetics it is produced by an electrical arc between a fine tip and the skin, and the way that arc is controlled is the whole difference between devices.
A plasma pen (often sold as a fibroblast pen) is a handheld with the generator in the grip. It makes a sequence of tiny arc points that create controlled micro-injuries, the "fibroblast" treatment used on eyelids, lines and skin tags. Consumer pens on Amazon run a few hundred dollars; professional pens run $1,000 to $3,000.
A plasma machine keeps the generator in a console and sends energy to interchangeable tips. That gives you adjustable output, a screen, tip options (jet, flake, roller, ceramic, diamond-shaped) and, on the PS30, cold plasma modes that run at skin temperature with no arc points at all. For a practice offering plasma as a service rather than an occasional add-on, the console is the professional tool; the pen is the entry point.