1.high accuracy 2.good stability 3.two-wire system 4~20mA DC( four-wire system for special) 4.solid components, patch-type printed circuit board 5.miniature, slight weight, reliable and shake-proof 6.span and outside zero point continuous and regulatable 7.positive migration amount to 500%; negative shift 600% 8.damping regulatable 9.good one-way overload protection 10.no mechanical and movable parts, little repair work 11.all series have unified structure, strong interchangeability of parts 12.membrane materials of contacting mediums optional (316L, TAN, HAS-C, MONEL , etc corrosion-proof materials) 13.explosion-proof structure, all-day use 14.smart HART on-the-spot main line protocol