A.0.5~0.7mm B.0.7~1.0mm C.1.0~1.2mm D.1.2~1.5mm
A.火花強烈 B.火花中等 C.火花微弱 D.無火花
A.50~180匝 B.180~240匝 C.240~370匝 D.370~500匝