JD series testing instrument for T-type guide rails of lifts, which are just for fast testing on working site with high precision.JS series laser calibrator for guide rails, could adjust the guide rail during installation and inspect the co planarity of two guide rails.JZC Series Laser Inspection System for Elevator Vertical Alignment could provide vertical datum for elevator installation and inspection. It took place the traditional plumb line procedure, have self-leveling system and ...