The Compact SPG Single is Scubapro’s smallest SPG. Its brass case makes it tough and sturdy, and the rubber boot adds further protection it. The gauge is very accurate and reliable, reads up to 400 bar and features the common red zone from 50 down to 0 bar. The indicator marks measure 10 bar increments. This SPG can serve either as a back-up for a transmitter, or as a primary gauge when diving with a wrist computer.