From pinpoint + -er.
pinpointer (plural pinpointers)
- One who or that which pinpoints.
- A type of hand-held metal detector.
[2021 May 31, Alexandra Marvar, “The New Detectorists”, in The New York Times[1], →ISSN:Detectorists may also carry headphones, a metal detecting shovel, hand tools such as a hori-hori (a serrated, steel hand shovel), a “finds pouch,” and a hand-held precision detector called a pinpointer.]