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Pi Tape® brand Blue Easy to Read O-Ring Inside Diameter tapes are best used for measuring diameters in low-light environments. They are not intended for use with chemicals or in corrosive environments. Tapes are constructed of Blue Easy to Read 1095 Spring Steel. They differ from our standard tapes by featuring a higher contrast facing of white lines and numerals on a dark blue background.

Each Pi Tape® brand precision measuring tape is furnished with a Calibration Report whose measurement results are traceable through NIST to the international system of units (SI).

Please click here to view our ISO/IEC 17025:2017 Certificate of Accreditation (pdf). Not all items we calibrate are included in our scope, however the calibration techniques and procedures are all in compliance with ISO/IEC 17025:2017.

Specialty sizes, widths and larger tapes are available upon request.

 O-Ring Inside Diameter Price List

 Custom Made O-Ring Inside Diameter Price List


O-Ring Inside Diameter Tapes Blue Easy to Read Metric Purchase Options


**The standard width for these tapes is 6.35mm gage member X 12.7mm vernier section.


Part # Size Gage Width Thickness Vernier Section Width Price Link
** RTM03EZ ** 50 - 300mm I.D. 6.35mm 0.13mm 12.7mm 250.00 Go to Product Page
** RTM1EZ ** 100 - 300mm I.D. 6.35mm 0.13mm 12.7mm 245.00 Go to Product Page
** RTM1SPEZ ** 50 - 600mm I.D. 6.35mm 0.13mm 12.7mm 429.00 Go to Product Page
RTM2EZ 300 - 600mm I.D. 9.53mm 0.25mm 19.05mm 270.00 Go to Product Page
RTM2SPEZ 300 - 900mm I.D. 9.53mm 0.25mm 19.05mm 451.00 Go to Product Page
RTM3EZ 600 - 900mm I.D. 9.53mm 0.25mm 19.05mm 286.00 Go to Product Page
RTM3SPEZ 600 - 1200mm I.D. 9.53mm 0.25mm 19.05mm 469.00 Go to Product Page
RTM4EZ 900 - 1200mm I.D. 9.53mm 0.25mm 19.05mm 325.00 Go to Product Page
RTM5EZ 1200 - 1500mm I.D. 9.53mm 0.25mm 19.05mm 336.00 Go to Product Page
RTM6EZ 1500 - 1800mm I.D. 9.53mm 0.25mm 19.05mm 353.00 Go to Product Page