WalMart ReliOn Confirm OR WalMart ReliOn Confirm Micro - same technology. The Micro is a bit smaller. If you have arthritis or other issues with your hands, pick what will be easiest for you to handle.
They use the same strips.
The unbranded version of these meters is available via ADW. You can find their link by clicking on the SHOP button above, then looking down the page for them. They are called the Glucocard 01 and Glucocard 01 Mini. The strips are available there, too, often with a discount when buying many at a time.
Practice on an apple and/or yourself first to get a feel for the process. It will help you be more confident when testing your cat.