R3-series Droid
the R3 series of astromech droids from Industrial Automaton had more memory and advanced circuitry than their predecessors, the R1 and R2 series, making them more efficient at calculating hyperspace jumps. The R3 was given a clear plastex dome as a marketing move, allowing owners to literall "see" the droid working on solutions. The specialization of the R3-series limited its applicability to military starships, but its high pricetag made the series highly profitable. Note that Star Wars Insider, issue 76, indicates that the R3 was considered a scout droid.