Yes, try it before you buy, but even the full version is limited and you have have buy the the iPhone/iPad versions seperately and for other docs you need to convieniently buy their other products.
Do a search for Collobos Fingerprint....yes, slightly more, one install and it will work on as many iphones and ipads, no apps to mess with.
Rolf Ing about Printer Pro Lite by Readdle, v3.2.4