9 industrial measuring systems for blown film extrusion lines, namely, gravimetric dosers, volumetric dosers, ultrasonic bubble measurers, capacitive and air sensor profile measurers and thermal air flow regulators, ultrasonic and infrared width measurers, load cell web tension measurers, and winding pressure measurers, and parts and components thereof, for the plastics industry; blown film extrusion line calibration devices, namely, calibration cages, sensing arms, and ultrasonic bubble controllers, and parts and components thereof, for the plastics industry; physical measuring and testing devices, apparatus and instruments, namely weighing scales, material profile measurement machines, elmendorf measurement machines, cof measurement machines, rheometers, dart drip measurement machines, color diffusion machines, tensile strength measurement machines shrinkage measurement machines, differential scanning calorimeters, thickness measurement machines, melt temperature measurement machines, and humidity measurement machines, and parts and components thereof; and metering devices, namely weighing scales, materials profile measurement machines, elmendorf measurement machines, cof measurement machines, rheometers, dart drop measurement machines, color diffusion machines, tensile strength measurement machines, shrinkage measurement machines, differential scanning calorimeters, thickness measurement machines, melt temperature measurement machines, and humidity measurement machines, and parts and component thereof