Which HRM for multiple HR zone training in a session?

sonofsammo

Hi all,
I'm doing the IronFit programme so that I can complete IM Wales next year to raise money for a powered chair for my daughter (check out website below for more info).
The programme has sessions in it that require working in two separate zones, for a certain time - e.g. 90 min z2, then 10 min z4, then 30 min z2.
Is there an HRM where you can pre-programme this? I've been looking and the only ones I've found seem to be able to set min and max, but not for separate zones for separate times.
Any advice?
Cheers,
Andrew

moonshine

Garmin 301, 305 etc all allow you to set HR parameter levels and speed and time and compete against a virtual partner - GPS too, 301 bit of a brick and isn't waterproof but can be picked up on e-bay for a reasonable price only downside doesn't have enough battery time for the amount of time it would take me to do IM