9 Electronic controls for film extrusion plants; plastic testing machines and calibration devices calibrating film extrusion machines and their components; industrial material testing and calibration devices for calibrating film extrusion machines; electric and electronic controls for film extrusion machines, machine parts, machine tools, pumps and fuel pumps; industrial measuring systems for thickness control comprised of a measuring device with measuring head, capacitive sensor, optical sensor, radiation sensor, laser, infrared sensor, rotating assembly, processing unit and control unit; industrial measuring systems for width control, comprised of infrared sensors, processing unit and control unit; industrial measuring systems for layer control and layer thickness control, comprised of a gravimeter, dosing unit, measuring unit for contact or contactless measurement, using laser, infrared and white light measurement, interferometer, processing unit and control unit; industrial measuring systems for temperature control, comprised of a contact temperature sensor and contactless temperature sensor; industrial measuring systems for pressure control, comprised of direct or non-direct pressure measurement sensors, strain gauges and pressure membranes; industrial measuring systems for line speed control, web speed control and RPM control, comprised of processing units and control units for rotational speed of the winder, nip and rollers, RPM sensors and speed transmitters; industrial measuring systems for control of web position, comprised of infrared sensors, adjusting unit and positioning unit; industrial measuring systems for tension control and torque control, comprised of load cells, processing unit and control unit; industrial measuring systems, comprised of charging level sensors, liquid level sensors, limit switches, proximity switches and electronic apparatus for testing film extrusion machines; apparatus and instruments for conducting, switching, converting, storing, regulating and controlling of electricity