In recent years wire systems used as direct and opposite sheers, elevators of heights etc have been widely used. As the practice shows, comparation of wires during the mounting and while in service, is a very labour-consuming process. Considering the mentioned fact it is recommended to pass to a method of indirect comparation. This job is reduced to the control of stable job of suspended wires by joint definition and comparison of the wires’ length difference, received in cycles with differences measured with light-rangefinder in the same cycles.