This Presidium Gem Tester II is the perfect for parts or repair. When testing gemstones the needle does not move or register the type of gemstones. It comes with a zipped case for easy transport and storage. The tester is made by Presidium, a trusted brand in the jewelry industry, for both identification and testing. Great project for a handy person. Thank you for visiting my store. All items are wrapped and shipped with care. Have a great day!