1.適用于盲孔或通孔精密測(cè)量 For blind hole or through hole measuring. 2.有接長(zhǎng)桿適用于深孔測(cè)量 With extension rod for deep hole measuring. 3.配校對(duì)環(huán)規(guī) With set ring. 4.硬質(zhì)合金量面 Carbide contact points.