First conceived in 1972 when a liquid fillable gauge appeared on the American market, McDaniel developed the first all stainless, liquid fillable, field repairable line of pressure gauges. With pressure ranges from 1.6 inches of H2O(WC) up through 60,000 psi and dial sizes of 1-1/2", 2", 2-1/2", 4", 4 1/2", 6" and 10" - of quality construction; all-stainless steel, brass, etc. We have the largest and finest selection available. Many "first of its kind" were manufactured with only one thought in mind: "purposeful construction". Economical and dependable operation with cost as only a secondary consideration. Engineered to withstand 300% full scale pressure without rupture of the bourdon tube and 130% full scale pressure(for all instruments larger than 2 1/2") without loss of accuracy makes us the exception in the marketplace today.