Calipers for measuring gemstones, diamond, moissanite and Lab Grown diamond; Circuit testers; Comparators; Electronic apparatus for testing the electrical conductivity of gemstones, diamond, moissanite and Lab Grown diamond; Electronic ultrasonic test equipment, namely, ultrasonic flaw detectors, thickness testers and hardness testers, for non-medical use; Inspection machines for the physical inspection of gemstones, diamond, moissanite and Lab Grown diamond; Machines for testing gemstones, d...