Glass-Trac Reflex Gauges use prism glass to provide an excellent indication of the liquid level.
All liquids appear black in contrast to the mirror-like surface above. The clean line of separation can be sighted from many yards away.
Reflex Gauges are made in three pressures series (maximum 4,000 psig at 100° F) and are tapped for 1/2" or 3/4" NPT connections.
The standard Glass-Trac level gauges are designed for minimum -20° F service.