Fig. Inter. - Figure Interval. Increments between PSI numbers on gauge face.
Grad. Inter. - Graduation Interval. Fractional increments between PSI numbers on gauge face.

Features:

• 2-1-2% Accuracy on 2 1/2"; 1% accuracy on 4"
• Acrylic window with membrane assembly
• Copper alloy bourdon tube
• Brass movement with highly polished bearing surfaces
• Glycerin filled
• Ambient temperature range of -4ºF to 140ºF
• 2 1/2" Face gauges have solid cast brass case with polished brass slip-fit ring
• 4" Face gauges have cast brass, silver painted case with chrome plated brass ring