Ashcroft 1009S Compound Gauge -30 to 0 to 15 in Hg/psi 1/4 MNPT Stainless

Compound Pressure Range

The Ashcroft 1009S compound gauge measures vacuum and pressure from -30 in Hg through 0 to 15 psi. It is built for technicians and engineers who need a single instrument to monitor both negative and positive pressure in hydraulic or pneumatic systems. The 1/4 inch MNPT bottom connection fits standard process ports.

Sustained Process Use

The gauge uses a mechanical bourdon tube with no liquid fill, so response remains consistent during continuous duty without temperature-driven fill expansion. Accuracy holds at +/- 1.00 percent of span across the full scale. The 304 stainless steel case and wetted parts resist corrosion from aggressive media in long-term installations.

Smallest Graduation Decides Readability

The primary scale graduates at 0.5 psi and 0.2 in Hg, which determines the finest pressure change you can resolve by eye. If your procedure demands finer resolution, this gauge will not meet the requirement. No calibration certificate is included, so users must verify traceability before critical service.