Electronic Tape Extensometer Digital Display Convergent Meter Digital Convergence Meter Description: The Digital Convergent tester is designed to detect the deformation in tunnels and undergound caverns by measuring the contraction or elongation between 2 anchor points fixed in the walls of tunnel or caverns. Main technical parameters: Measuring range:0.5m~30m Number of displayed value:0.5m~30m Measure Accuracy:0.06mm Resolution:0.01mm Stability of displayed value:less than 0.01mm in 24 hours. Dimensions: 410mm×100mm×35mm