A continuous stream of compressed air is directed to the piston at the top of the point and pushes it downwards before being evacuated through holes on the side.

A spring pushes the piston and the point upwards again. It is possible to obtain very high vibration frequencies, between 200 and 300 Hz using relatively high levels of energy without any risk of overheating.

The actual design of the stylus, whose point and head vibrate between an air cushion and a spring makes it possible to mark flat, concave or convex surfaces without modifying the distance of the part to be marked.

The amplitude of the tool can indeed reach .25” (6 mm).

The main advantages of the electromagnetic stylus in comparison with the pneumatic technology are:

• - A reduced level of noise
• - Increased depth accuracy
• - A greater amplitude making for optimal quality markings on curved surfaces
• - Mono-energy operating

Under the action of the electromagnetic field, the core pushes the stylus downwards and a spring pushes it back to its start position.

The frequencies obtained are lower, around 80 Hz, but the amplitudes are greater however.

The impact force and therefore the width of a character's line and the marking depth will depend on the power of the electro-magnet. Only one electromagnetic stylus model is available, the EM11B stylus, which can cover a wider range of impact forces than pneumatic stylus.