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Electric Relative Density Test Apparatus (JDM-1). Automated Compaction System: Motor and sprocket drive mechanism for vertical hammering and round-trip vibration. Multi-Function Testing: Determines minimum/maximum density, soil porosity, and relative density for particles <5mm. Customizable Dimensions: Internal diameter 5cm, height 12.7cm including sleeve, with 4 rotor size options. Efficient Timing Control: Timing range of 0-15 minutes with 32 strikes per minute for consistent results. Compact and Portable: Instruments weight is 40kg, suitable for laboratory settings with 120W power consumption.