309-35048-391B Deep Throat Digital Thickness Gage Roller Contacts 16" Reach, .00005" ResDeep Throat, High Resolution Digital Thickness Gage with Roller Contacts Deep Throat Thickness Gages are precision measuring tools used to measure the thickness of materials in hard to reach or confined areas. They are designed with an extended reach or "throat" that allows them to measure the thickness of materials in areas where traditional thickness gages cannot reach. This Deep Throat Thickness Gage includes special J50R Roller Contacts designed