Towa Digital Bobbin Case & Top Thread Tension Gauge, Body Only
Featuring a compact design with a clear LED display, this device offers 12 times the measuring range compared to analog Towa units. It includes interchangeable inserts for Standard (L-Type) and Large (M-Type) bobbin cases (sold separately). The unit measures tension for both bobbin case thread and upper thread in one compact device, ranging from 1mN to 5000mN. It operates on 3 AAA batteries (not included).
To use this gauge, you must purchase an adapter that matches your bobbin case size:
The tension gauge will NOT work without one of those adapters.