... :3/6:4/5:5 *Test Density,Percentage,Karat 300g/0.01g 6K-24K Density Purity Tester MODELMH-300KMaximum weighing300gMeasurable range5-300gWeighing ... interfaceRS-232Instrument accessoriesaccessories, Thermometer, Tweezers, Calibration weight, Acadapter, Opration manualManufactureNapco Precision Instrument Ltd 300g/0.01g 6K-24K Density Purity Tester