Which HRM with Tacx Cycleforce Flow

I picked up a Tacx Cycleforce Flow trainer this week and was wondering what heart rate strap people use with it. The one I got was a couple years olds so not in original box so I don’t know if there is a heart rate strap that usually comes with it. However, I don’t see one as an accessory you can buy from Tacx so I wasn’t sure.

Would be interested in knowing what people have used with their Tacx trainers.

Thanks in advance
Nate

Looks like this non-coded transmitter from Polar is the only way to go:

http://www.polarusa.com/us-en/products/accessories/T31_transmitter

I found a Canadian website which said this works with the Tacx Flow.