- Edmonton, Canada
- US $44.99
- Jan 30th
2 OS-3 Observational Systems Event Recorder With Manual This set consists of two OS-3 event recorders and a set of manuals. The event recorders are almost identical, but one of them is missing two screws that hold the end plate in place. Each has a DC power connector, a power switch, 1/8" phono connectors labelled audio in and out, and a 25-pin D connector labelled I/O on the end.