Blood Glucose Test Strips, Coding

One of the questions I have needed to
research the last few weeks arrived in the month of August and asked
why each vial of test strips had a code that needed to be entered
into the meter. I knew this was true, but not a question I had all
the answers to or the reasons behind this requirement. Then the
question expanded to meters not requiring coding and why. This I did
know, but I will cover