In order to reduce and prevent the coal mine roof-fall accidents

to monitor stress of roof in tunnel is necessary.introduces A new type of static resistance strain gauge of mining anchor cable（roof bolt）

using single-chip microcomputer as the main control module

adopting an unique balance bridge arm structure and choosing high precision operation amplifiers for signal conditioning.The gauge has realized data acquisition

storage

inquires and other functions as well as high precision

low power consumption

easy operation

anti-interference ability and other characteristics.It provides reliable test method and technical support for engineers who engaged in tunnel supporting and tunnel anchoring.