A5 is 210 x 148. A standard iPad is smaller
Given the ipad was the thing that has set this whole issue off, I hardly think CASA is going to ban use of them. The screen ipad is 197mm high, is it not? Given there's at least a bit of white space around each page, a page will fit on an ipad screen OK. Obviously an ipad mini would be stretching the friendship and a ruling would need to be made about that. Sounds fair though if it's a backup only.