inductive rotational speed sensor / threaded

I’ts a rotation control device with the shape of a cylindrical threaded metallic sensor M30x1.5 inductive sensing featuring an activating distance between 4 and 6 mm on metallic material.
This device measures the time gap between two signals detected on a revolving or cycling mechanism.
When the time gap becomes smaller than the pre-set value, the device itself activates and signals an increase in velocity of the revolving or cycling unit. If the time between the impulses is greater than the device pre-set time, than the unit does not commute, thus letting the device work regularly.
These devices are the ideal solution in applications where it is necessary to check the speed increase in revolving or cycling units.