Dwyer 2020 Magnehelic® Differential Pressure Gauge - 0-20 Inches Of Water Vacuum Pump Oil It also checks gas-air ratio

It also checks gas-air ratio controls and automatic valves

All basic models without controls are UL listed and CSA certified for use in areas designated as Class 1

Piston ring air seals

Inland ULTRA® products are designed to endure thermal and chemical stresses much better than standard vacuum pump fluids

even if advised of their possibility

Dwyer 2020 Magnehelic® Differential Pressure Gauge - 0-20 Inches Of Water Vacuum Pump Oil It also checks gas-air ratioSERIES 2000 MAGNEHELIC DIFFERENTIAL PRESSURE GAUGE Dwyer's simple, frictionless Magnehelic gauge, it quickly indicates low air or non corrosive gas pressures either positive, negative (vacuum) or differential. The design resists shock, vibration and over pressures. No manometer fluid to evaporate, freeze or cause toxic or leveling problems. The Magnehelic gage is the industry standard to measure fan and blower pressures, filter resistance, air