Spotted this amongst some reductions on fitness gear. As ever with Sainsburys, its pot luck whether your store may have them or not!
Originally £19.99 according to the shelf. £25 at Amazon.
Sigma PC 11 Heart Rate Monitor, with chest strap and bike mount.
Adjustable Training Zone
My name function
Looks like a reasonable entry level HRM, it is a lot less bulky than a lot of the cheaper ones out there. It's non-coded so should work with most gym machines.