which type of set (pos,tablet,…) can be used for registering delivery information at outdoor?

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hi all IT specialists
we got a project about gathering money for a charity organisation
in which the organ agents monthly go to the members (i.e members's home or office) and get their aid.
but after getting aid the agent should have a handy set (i.e mobile Pos or Tablet or ...)
for registering aid info and deliver receipt for member.

my question is that which type of handy set we should use ? Pos or tablet or ...
the handy set should be cheep and easy for develop software.

have any body experience like this?