Metric O-Ring Gauge by Ghrrum | Download free STL model | Printables.com
O-Ring Gauge Make Work Smart, Telescoping O Ring Sizing Plastic Gauge, Slide Style National Type, for Measuring O Rings Inner Diameter, OD, Thickness Gauge Black: Amazon.com: Industrial & Scientific
O-ring Gauge Make Work Smart Blue Telescoping O Ring Slide Measuring Id Gauge 13-1/2"long Extends To 23-1/2" O-ring Sizing Gauge - Oil Seals & Other Seals - AliExpress
O-Ring Sizing Cone - Measure O-ring Sizes - Rubber Fab