The US Gauge 1931 / 1933 SOLFRUNT Pressure Gauge are 4.5 and 6in diameter gauges with an aluminum black-flanged case, with low mount and low back mount installation styles. The 1931 features an EZ-Fill case with a factory fill of silicone, glycerin and mineral oil available for the 4.5inch dial size upon request (or via EZ-Fill Kit). Fill fluid drastically improves service life by helping to absorb some of the impact of excessive vibration. Glycerin is oft-used for room temperature applications, whilst silicone and mineral oil are used for higher operating temperature ranges.

The 1931 and 1933 offer combined ranges from vacuum (30inHg) through 6000psi, with dual scale options available for compound and gauge ranges(1931 gauges only). The 1931 and 1933 both offer high accuracy, consistent data with reads within .5% of span. Span adjustments are easily made through the back of the case, and pointer adjustments through the front via simple removal of the ring and window. Both models come with 316L stainless steel wetted parts, bourdon tube, and a high temperature tested acrylic window. Shatter resistant glass is available.