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巷道月进尺超过200米时;因为要经常改变方向,用锤球或光学对点仪,甚至用A-26型白炽灯指向(作用距离40～60米)的效果都很差。因此,应全面改用以激光作光源的指示器。多年来,哈尔科夫精密仪器厂一直在成批生产-7型指向仪,现已计划生产更为完善的-9型指向仪。这两种仪器主要用于掘进坡度为0～35‰的石门、平峒、脉外平巷之类的直线水平巷道。在坡度很大的巷道中使用激光指向很困难,而陡急的巷道则不可能使用激光指向。
Roadway monthly footage of more than 200 meters; because of the need to change direction often, with a ball or optical point on the instrument, and even with the A-26 incandescent lamp pointing (effect from 40 to 60 meters) the effect is poor. Therefore, we should fully use the laser as a light source indicator. Over the years, Kharkov Precision Instrument Factory has been mass-produced -7-type finder, now plans to produce a more complete -9-type finder. These two kinds of instruments are mainly used for driving straight-line roadways such as Shihmen, Pinghu, and extravenous lanes whose slope is 0 ~ 35 ‰. It is difficult to use laser pointing in steeply sloping aisles, while steep aisles are not likely to use laser pointing.