Applicable to rocks with clay mineral, must understand rock expansion feature, in order to control t underground rock light body impact during excavation process. Rock lateral restraint expansion rate and expansive rock pressure test is suitable for all kinds of rocks.

Xi’an Zealchon Electronic Technology Co.,Ltd adhering to the "professional,  honest, and providing the best service" business philosophy, with the guidance of professors and researchers from the Well-known institutions in China,      developed a series of leading domestic and international standards, Technology class detecting instrument for asphalt and asphalt mixture, Road, bridge deck, geotechnical, structural, etc and OEM designed 12 series more than 100 kinds of laser productswith high power and long service time.