The range of this tension gauge can be measured from 10mN(1gf)-5,000mN(500gf).
So, it is possible to measure a high range of tension. (mN or gf selected by switch.)
Too fast of a thread pull will cause the tension reading to go up to fast. Pull slowly. .

It is possible to only replace the TM501 attachment with TM502 attachment included, and to measure both a standard L and large type M bobbin cases.

  • Compact design with easy-to-read LED display
  • Provides 12-times the measuring range of analog Towa units
  • Interchangeable inserts allow body to be used for Standard (L-Type) and Large (M-Type) bobbin cases
  • Measures tension of both bobbin case thread and upper thread with one compact unit
  • Battery operated (3 AAA batteries, not included)
  • US Warranty 1 year limited warranty on defects in materials and workmanship.
  • Non-US Warranty: 30 days parts and labor
Other Images

icon Not only under thread, but also upper thread

icon Towa DTM-A1 L & M Bobbin Case Digital Thread Tension Gauge, 0-500g Pull

icon Only Difference in DTM-A1 and DTM-A2 Bobbin Case Holders is the TM501 and TM502 attachment brackets shown.