實際電繡過程中，線的張力鬆緊度會依據使用線材不同而有所調整，tajima有出 上線張力計與底線張力計，照片中的物品為上線張力計 (upper/under thread tension gauge)，英文名稱有under因為實際操作也可使用這個來測量底線的張力
說明書有英文與日文版，較常用到的應該是第二段
02. MEASURING THE UPPER THREAD TENSION
1-
Wind the front end of upper
thread [2] which has been threaded to the presser [1] around the hook [4] of
the gauge [3] about by two turns.
2-
Read the indication(tension) of
the gauge [3] while pulling it horizontally at a rate of 2-3 cm/sec.
SUPPLEMENT: Tension values of typical kinds of threads are indicated below for
your reference. Please note that the values will vary depending on embroidery
conditions.
實際操作建議為：多留15cm左右的線，纏繞前端兩圈或多圈後，水平緩慢拉動，拉動時請平放且速度建議為每秒2至3cm，觀察數字是否達到想要的數據。
【2019/06/30- 跟tajima購買的，$450元】
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