Merit's PSC Series Altitude Gauge is designed to accurately read the head pressure (level of liquid in a tank, well or other vessel). Offering 0.5% FSA, Merits PSC Series come standard with an aluminum case, polished 304 SS ring, glass lens, micrometer adjustable pointer, brass socket and Phosphor bronze bourdon tube. 316 SS internals are available and this gauge is customizable with custom dials, laminated safety glass, back flanges and other options.