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✓This is a TOWA Tensiometer with a "L" type bobbin insert holder. You can see the size on the picture! TM-501 bobbin inserts USE FOR SMALL BOBBIN CASES "L" Style.
✓Compact design with easy-to-read LED display provides 12-times the measuring rage of prior Towa units
✓Measures tension of both bobbin case thread and upper thread with one compact unit.Battery operated (3 AAA battery, not included)
✓You can use this gauge to preset the tension on each bobbin case. To make sure every bobbin case change is the same and eliminate the need to run a pre-test on your sewing project for loose, or tight stitching.