Tech scanners[1] or technical scanners[2] were handheld devices that were used by technicians to help diagnose a variety of technical and mechanical problems[1] in repulsorlift drives or other common machinery.[2] The Techaide, manufactured by Drever Corporation, was a type of tech scanner.[1]
Sources
"Cracken's Rebel Field Guide: Scanners" — Star Wars Adventure Journal 4 (First mentioned)- Gundark's Fantastic Technology: Personal Gear
- The Essential Guide to Weapons and Technology