Dial size40mm, 50mm, 65mm, 80mm, 100mm, 150mm & 250mm Accuracy+ 2% of f.s.d. Bourdon TubeBrass / Phosphor Bronze / S.S. 316 MovementBrass / S.S. 304 SocketBrass/S.S. 316 CaseMild Steel / S.S. 304 MountingDirect with bottom entry / Direct with back entry / Flush Panel with back entry (Three hole panel or bracket type) / Surface with bottom entry Thread Connection1/8", 1/4", 3/8", 1/2" BSP/BSPT7 NPT (M) WindowGlass / Polycarbonate. JointsS.S. Bourdon tube tip and the socket ends are ARGON ARC WELDED and phosphor bronze bourdon tubes are silver brazed / soldered. Bourdon tubes are heat-treated and stress relieved.