Among all the metal analyzers, versatile gold analyzer is the most widely used one. The GoldXpert is a stylish countertop analyzer fit for the consumer showroom environment. Designed to be compact and lightweight, weighing only 22 lbs (10kg), the GoldXpert can be transported easily to wherever testing is needed. The GoldXpert gives accurate chemistry and karat results within seconds. http://www.skyray-instruments.net/metal-analyzer/spark-optical-emission-spectrometer/