The EI means EASTIMAGE, it is the brand name and short company name. The numbers means the tunnel size, 5030 means 50cm W x30cm H, 100100 means the tunnel size is 100cm Wx100cm H.The last number means different configuration of the same size machine, 5030C, and we also have 5030A, they are different

X-ray machines are different mainly in the tunnel size. Small size to check hand held bags, because the tunnel is small. Big bags can not pass through.Middle size and large size can check bigger luggage and cargo, they are used in different places.

A x-ray baggage scanner is security inspection machine, to check passgeners hand held bags, luggages to see if any dangerous thing inside like a gun.We can see the machines in the airports, some important government guildings and 5 stars hotels etc. They use the machine to check the bags.No need to