Premium 304 Stainless Steel Compound Gauge with Brass Internals, -30 inHg/0/60 PSI, 2-1/2 Inch Dial, 1/4 inch NPT Back Mount related_2-size-polyester-felt-liquid-filter-bags-stainless-steel-ring-100-micron it quickly indicates low air

it quickly indicates low air or non-corrosive gas pressures--either positive

Vacuum Flow: 58-346 CFM

the upstream wave will travel slower and take more time than the (faster) downstream wave

but because of the variety of applications

Premium 304 Stainless Steel Compound Gauge with Brass Internals, -30 inHg/0/60 PSI, 2-1/2 Inch Dial, 1/4 inch NPT Back Mount related_2-size-polyester-felt-liquid-filter-bags-stainless-steel-ring-100-micron it quickly indicates low airPremium 304 Stainless Steel Compound Gauge with Brass Internals, 30 inHg 0 60 PSI, 2 1 2 Inch Dial, 1 4 inch NPT Back Mount Range: 30"Hg 0 60 PSI Dial Size: 2. 5 Inch Connection Type: 1 4 Inch NPT Male Connection Location: Back Body Material: 304 Stainless Steel Internals: Brass Lens: Acrylic Liquid filled with glycerin to dampen the effects of vibration and extend the life of the gauge Useful for Air and Water Applications Available with optional 1