Tubular Inside Micrometers Series 137-Extension Rod Type,Series 139-Extension Pipe type,Series 140-Extension Pipe Type

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Series 137


  • Wide range of ID measurements by combining extension rods (pipes) and anvils with the micrometer head
  • Carbide-tipped measuring faces are available. (series 137)
  • The 139 and 140 series use highly-durable/ large-diameter extension pipes.
  • Series 137 supplid in fitted plastic case except 1550mm/60in come in wooden case.
  • Series 139 supplied in fitted wooden case except 500mm/20in come in plastic case.
  • Series 140 supplied in fitted wooden case.

Technical Data
Accuracy:  ±(.00012+.00005n+(.00004×R/2))in
Graduation: 0.01mm or .001"
*with carbide tipped face