Where movable type is the most popular and Magnetic Yoke with small size, light weight, can be legs are touching the audit 3-6 inches with the switch-off as needed.
Which can be immobile and used Magnetic Yoke type is small and lightweight. The legs can be adjusted to detect a touch with a 3-6 inch switch - off as needed.
Which can be moved and used is a type Magnetic Yoke is a small, lightweight with the legs can be adjusted to touch with check 3-6 inches. There is a switch on-off as needed.