DJLC-A concrete thickness gauge is composed of signal transmit, connector, signal ... ,Error ±1mm. Use second Range:200—600 mm,Error ±2mm; 601—800 mm,Error ±3mmData storage:45000 point(include build number ... :φ2550×80mmExtension Bar:φ25×600(mm)(3 piece)Work PrincipleDJLC-A concrete thickness gauge is composed of signal transmit, connector, signal ...