What other devices, aside from an expensive I-Pad, are suitable for using as a square register - preferably not having to go online to do so. I have a massage company that sends therapists to homes / hotels to to out-call work. A larger monitor than a phone, and cheaper, yet which uses cell service (there's not always internet) is what I'm looking for. As I have to purchase at least 8 of these - cost is a consideration.

When using phone-sized devices, people often miss the tip line at the top - so a larger monitor is needed.

Thanks