It features a metal handle andapreset knob that helps reduce wrist strain.它采用金属处理和预设的旋钮，可以帮助减少手腕的压力。 FTD2-S features a memorypointer,resin grip and colored scale for easyreading.FTD2 -S采用内存指针，抓地力和有色树脂规模，便于阅读。 t does not a have thepreloadmechanism. 它不是一个有预装机制。