Solid front, blow-out back all stainless steel PSF Series safety case gauge. Standard features include 304 SS case, 316 SS internals, 1/4" NPT or 1/2" NPT bottom connection, glycerin fillable case, laminated safety glass lens. Available in 2.5" (63mm), 4" (100mm) and 6" (150mm) dial sizes. Standard pressure ranges from -30" Hg Vacuum up to and including 10,000 psi (and equivalent kPa and bar ranges) with 1% full scale accuracy. Available in single scale or dual scale pressure ranges.