Dial Size,150mm & 250mm Accuracy,Test gauge: +0.5% of f.s.d. Master gauge : 10.25% of f.s.d. Element,Bellow, bourdon tube Element Material,Test gauge: Phosphor Bronze/SS 316 Master gauge : Beryllium Copper. Movement,Precision S.S.316, High Precision Jewelled Bearing with Bi-metallic link for Temprature Compensation. Dial,Anti Paralax Mirrored Scale. Pointer,Knife edged, Micrometer zero adjustable type. Socket Material,Brass/AISI 316 SS Case & Bezel,Die cast Aluminium Weatherproof housing, with screwed outer bezel, Stoved enamel black finish. S.S.304 snap action bayonet type. Joints,Silver brazed / Argon arc welded Connection,1/2"NPT(M)/BSP(M) Mounting,Direct with bottom entry / Back with Panel Mounting with clamps Range,0-1000 mmWc to 0 -10,000 mmWc -760 mmHg to 0 0 -1Kg/sq.cm. to 0 -1000 Kg/sq.cm. Least Count,As per standard accuracy chart for + 0.5% and 10.25% Glass,Tinted green or offwhite antislave acrylic type, Toughened or Laminated type.