Feature:1. Can be used for jewelry ring measuring, including diamond tester pen, magnifier and other tools.2. Delicate handle of the ring mandrel, accurate and efficient for ring size measuring.3. Diamond tester pen used for jewelry display or identification assistance, can directly display the light color effect.4. Professionally measuring rings and having a magnifying glass, an essential set of tools for making jewelry.5. Complete measuring tools, ideal for professionals and jewelers or amateurs at home.Spec:Condition: 100% Brand NewItem Type: Jewelry Test ToolMaterial: Plastic + Copper Usage: Professionally used to measure the ring size, with a magnifying glass , it is an indispensable set of tools for making jewelry, more convenient for you to use, and it is also a good choice for giftsAccessories: measuring tape, diamond tester pen, ring mandrel, tweezers, diamond claw, magnifying glass, diamond tester, ring mold, etcDetailed introductionDiamond Tester Pen: Powered by 2pcs AAA batteries (not included)Purpose: To observe the effect of diamond light color.Usage: Control the switch and turn on the tester pen. Use the tester pen to illuminate the diamond color edge in parallel to achieve the ideal observation effect of light color.(The reflection surface of cut diamond is flat and the effect of light color is apparent)(The reflection surface of cut diamond is less or uneven, and the effect of light color is not apparent)Diamond Tester: Powered by 9V battery (not included)Use steps: 1. Turn on the power switch, the power indicator lights up, and the instrument begins to warm up. After a few seconds, the preparatory indicator lights up, indicating