Howdi All, I keep a serial number and product name log of all the CIS products I purchase. Which means the using a Bar code scanner to make life easier. The scanner I use is the 5100BCS. When I scan the ?lift peel, serial number? on the outside of the box. It usually works first or second go, for example 001001093XXX. When I try and scan the lower bar code, which is my preferred method, containing the model number as well, for example 5858R4F2AA 001001093XXX it does not work 9/10 times or worse. This may seem trivial to most, which I can understand, but is not to me. The scanner works flawlessly on most items, most of the time. However on the bar code as described above it seldom works at all. Could the size, shape, density be looked into to resolve this issue. The issue is not the scanner, it is the code on the box. Cheers