1 or 3 channel ekg

[ncparamed]

Hi everyone, I was wondering if it really matters whether we use a 1-channel or 3-channel ekg for exams. I currently use a 3-channel, which is provided through one of the big 4, but I'm starting direct exams now and need to purchase my own ekg machine. I've seen both used, but didn't know if there was a standard on the carrier/uw end. Thank you in advance.

ncparamed