The ATS absolute 500 PSI pressure sensor reads positive pressure to 500 PSI while allowing negative pressure down to 14.69 Psi (-29.92Hg) to be read.

Don't have an ATS Scope to power pressure transducers... No problem! Consider an ATS Pressure Pro PTR2000, Pressure Transducer Cable PTR1080, and a Pressure Pro to BNC Cable PTR1100 to allow your voltage measuring equipment to power the transducers