Alfa Mirage GKS-3000 Precious Metal and Specific Gravity Tester. This specific gravity machine tests yellow and white gold, platinum and silver. Max capacity of 3000g x 0.01g it allows samples as small as 2g to be measured. Unit is built for easy operation with split lid, 5 time selections, and draft shield. Purity is displayed in both percent and karat. Measures 10" x 7" x 7" and both AC adapter and PC interface are included. Also available in 300g capacity (SCGK300S).