General instruments, established in 1966, has seven manufacturing units - all iso 9001:2000 certified. The company is in the field of manufacturing primary process control instruments covering major engineering parameters: pressure, temperature and flow. It has international approvals, viz., ce, ul [underwriter laboratory], csa, canada and crn, canada, features: of p bourdon sensing, manufactured strictly in accordance with en 837, 4"/6"/10" dial, a1, phenol, ss casing, ferrous/non-ferrous system, ± 1 per cent/0.5 per cent fsd accuracy, glycerine filled case with external zero setting available.