THESE CARDS ARE FOR USE WITH THE POPULAR CPM ELECTROCARD METER.
These card meters are set with an area code and the cards will not work if the code doesn't match the meter's code.
If you originally purchased your meters from us then we will know your card meter code.
If you didn't get your meter from us then you need to know your code. This may be displayed on the cards you have.
Please contact us and we will help you determine your card code before ordering.