O Ring Material Identification Tool

A unique but simple tool which helps you identifies certain O-Ring compounds.

O-Rings of 60, 70 or 80 durometer which are already known to be a Viton®, Kalrez®, Nitrile or EPDM.  The O-Rings must be within their shelf life and unused. The MID 70 will indicate the material composition of 100, 200, 300 and 400 series of the AS568A dash numbering system.

Simply place the tool on the cross section of the o-ring, lift the calibrated weight and release. The height of the first bounce identifies the O-Ring compound.

A must for anyone who deals with O-Rings.



  • Verify an O-ring at moment of installation
  • Check for mislabeled O-rings
  • Verify new O-rings
  • Sorting application
  • Differentiate between known O-rings
  • Sturdy stainless steel tubular construction is safe to carry in tool boxes
  • Pocket clip for easy access



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