Magnetic heads MH 80-120 and MH 100-150 have similar design, and differ in dimensions and weight. These heads consist of two separate modules which are installed on the rope with a special roller system and tools, supplied in the kit. The heads are aligned on the rope with adjustable wheels. The Hall Effect sensor unit is not detachable and the coil sensors are detachable. Special compartment is provided on the heads to attach basic unit.