Woodpeckers SSPRO-CA Story Stick Caliper Arms supermax Static pressure (inch of water):

Static pressure (inch of water): 18

Overall Length (L): 3-25/32"

or the garage of the do-it-yourselfer who does his own metal work

With these features

Woodpeckers SSPRO-CA Story Stick Caliper Arms supermax Static pressure (inch of water):Caliper arms allow you to quickly create a physical stick to use as a cut to reference. The arms are offset to the inside from one direction and the outside from the other. The inside offset is used for the inside measurements and the outside offset for outside measurements. Say you want to put a perfectly fitting shelf between two cabinet sides. Simply adjust the arms out until they contact the sides, lock them in place and use that physical example