QT-80-type instrument roadway convergence QT-80-type instrument roadway convergence QT-80-type instrument roadway convergence price, single hydraulic prop detector parameters, pull up anchor device manufacturer in the history of the most favorable product rich handsome this product The decline of force designed to measure the roadway surrounding rock pressure at the time, the amount of shrinkage of roadway (ie the time pressure, the deformation of the area under the time). Is simple and practical, stable and reliable measurement of performance, easy reading test, measurement accuracy can meet the requirements and reduce the maximum contradiction measure the impact of the production process, etc. Technical parameters: (1) measuring range: 0-120mm (2) Measurement Method: extension spring scales to scales (3) Accuracy: 0.05