We just outfitted our inspection staff with Samsung Galaxy Active phones. The reason we opted for that model is that it has a dictation function that has been found in our testing to be highly accurate. Inspectors can dictate their notes into an email or other document and the app records to voice to text. Inspectors review and correct any errors (not many) and use them as their notes.
We do also have inspection and investigation notebooks based on the OFM Investigation notebook template, but modified to include checklists and cheat sheets for staff as they are going through a building.