lead gauge=
lead tester, Zeiss lead tester, screw pitch gauge, thread pitch gauge, English screw pitch gauge, metric screw pitch gauge, screw-pitch gauge, international screw pitch gauge, pitchometer
管制螺纹需要测量导程和锥度,以确保内外螺纹能紧密接触,起到密封的作用!这种量具配管和维修人员使用的多些!