The transmitter
strap works with most heart rate receivers found on exercise equiment such as tredmills and elliptic trainers. You can test out the accuracy of the
strap at your local gym.
At least you can test out the
strap this way. I have purchased replacement
straps on eBay for the
X6HR -- almost any generic
strap works with the unit.
I am presently using a Rbk
strap I purchsed on Woot for $15 (it included a watch as well.)