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