How to Measure an O-Ring - Hi-Tech Seals - YouTube
8 Simple Ways to Measure an O‐Ring Diameter - wikiHow
O-Ring Tapes, O-Ring Tape for measuring the inside diameters of o-rings and other soft walled parts, manufactured by Pi Tape Corporation - Newman Tools
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 Size Chart : The O-Ring Store LLC, We make getting O-Rings easy!