Magnet attached to one end of a pivoting balanced arm and connected at the other end to a calibrated hairspring. By rotating the dial with a finger, the spring increases the force on the magnet and pulls it from the surface.
Magnet attached to one end of a pivoting balanced arm and connected at the other end to a calibrated hairspring. By rotating the dial with a finger, the spring increases the force on the magnet and pulls it from the surface.
Accuracy
Durability
Ease of Use