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
Parker - O Ring Sizing Cone - 65062994 - MSC Industrial Supply
8 Simple Ways to Measure an O‐Ring Diameter - wikiHow
O-RING SIZING GAUGE SLIDE STYLE NATIONAL TYPE TELESCOPING SIZE GUIDE | eBay
O-Ring Measuring Tools | Fastenal
OR-GAUGE - Hercules for o-rings, hydraulic seals, cylinders