"DATA" takes the place of guesswork. |
Ideal for measuring the thread tension of a bobbin case. |
BTG-1: Used with the following bobbin cases: 52237, 541678, B75, KF220370, B1837-027-0A0, 117596-0-01 & 2-20 |
BTG-3: Used with the following bobbin cases: 18045, P413830, H-15, B1837-201-0A0 & 147790-0-01 |