SILVER BRAZED & MOISTURE PROOF CONSTRUCTION; BLACK DIAL WITH WHITE PRINTED MATTER; AMBIENT TEMP. RANGE IS -65.0 TO +225.0 DEG. F.; INTERNAL OVER PRESSURE STOPS; SILICONE OIL TREATED MOVEMENT; SAFETY BLOW OUT PLUG ON BACK OFCASE; OPERATES WITH HYDRAULIC FLUID PER MIL-H-6083 OR MIL-H-46170; CASE & MTG. BRACKET ARE BONDED TO WITHSTAND 50 LBS. FORCE MIN. TO SEPARATE