Each tube of 5 comes with its own code chip which fits in the back of the meter. For accurate readings, this must be inserted (after removing the previous one) when you start a new box of strips.
The maximum shelf life is 12 month.
1 pot @ £9.36
2 pots @ £9.00 each
3 pots @ £8.64 each
4 pots or more @ £8.28 each