Basic unit INTROS is compatible with each of the magnetic heads. The intrinsically safe built-in data logger is capable to store inspection data from ropes of up to a total length of 30,000 m. The LMA and LF data are displayed on two displays: LMA in % and LF in mV. Besides LF number per lay length, current distance on rope and speed of the rope are also displayed and stored. The basic unit is battery powered with an energy-saving feature. The rugged membrane keypad and leather pouch securely protect the unit from dust and rain. The basic unit INTROS® is a hand held device with light weight, and can be easily attached to magnetic head to travel along the rope; in this case basic unit can be connected to the head with short cable. Telemetric system provides wireless connection of basic unit with computer.