Plain tracer: With plastic or natural wood handle; Metal Saw Tooth and economical using.
金属齿式描线轮:塑柄或原色木柄,轮体部分为金属锯齿,经济实用。
tracing wheel:描迹轮,描线轮
tracing valve ==> 仿形阀 | tracing wheel ==> 描迹轮,描线轮 | track address ==> 磁道地址,道地址