These 2-1/2-in. pressure gauges feature a spiral bourdon tube and full-scale accuracy of ± 1.6%. Cases are 304 stainless steel, and are glycerine filled for built-in pulsation dampening. With 1/4-inch NPT bottom connection. They are offered in 18 standard dual-scale (psi and bar) ranges, from 0-30 to 0-15,000 psi.