I am a tech priest in a Tattered Fates campaign, and I need a multi-tool. Problem is that my DM and I can't find the tool referenced in the main book or the campaign. My DM and I know it exist because we see reference to it on the forums, but no mention on where to find it in the source books or campaign.

I believe you can find it as "Combi-Tool" on p 150 in the core rulebook.