For over 40 years, S & G Tool Aid has supplied the automotive aftermarket and related industries with a wide range of general automotive and autobody tools, equipment and mechanics' aids. S & G products are innovative and manufactured to professional quality standards. Large gauge calibrated at 0-600 Psi, 0-4,000 k Pa, 0-40 Bar. Small gauge calibrated at 0-50 Psi, 0-3.5 Bar. Includes an adapter with two grooves, for use on most Asian and some American and European vehicles, with thread size of 8mm-1.00 Male x 1/8 in. NPT Female. Supplied in a durable, plastic molded storage case with carrying handle.