Model BZYS-4212 The surface vibration compaction meter Purpose: used for determination of free drainage non-viscous big grain and coarse grained soil (including the pile of stones) the maximum dry density of soil test apparatus. Technical parameters: 1.Voltage :380V 2.Power:≤1000W 3.vibrational frequency:30-50HZ 4.Vibration force:10-80KN 5.Ram plate effect in the sample surface static pressure:13.8KPa 6.Test tube specifications: Aluminum tube of a diameter:280mm 7.Small aluminum tube inner diameter: 152mm