A Few Words About McDaniel Gauges. We have the largest and finest selection available. The 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 without loss of accuracy makes us the exception in the marketplace today. After all - it costs more to replace a defective pressure gauge than the original purchase price - it really doesn't cost more to use McDaniel gauges. It's economical!