Diamond Tester Pen: Designed for fast, accurate and safe diamond detection. Features: The tester is lightweight and compact, with a PU bag, easy to carry. Non-destructive testing, do not hurt your diamond. LED light and audio result display, make it easy to read your precise testing results. Easy to operate, just turn it on, lightly put the tester pen tip to the diamond, and wait for the result. An ideal for buying jewelry, buying or trading diamonds, auctions, etc. Powered by 1 DC 9V battery(not included). Usage Method: 1. Put the 9V battery in(not included), switch on the power. 2. Take off the probe cap, after about 10 seconds of warming up, the Ready indicator lights up. 3. Put the diamond tester pen vertically against the diamond surface, wait for the result. 4. If the machine makes a beeping sound and the light is red and full, it means it is a real diamond. Conversely there will be no sound and the light is 5 frames or less. Specifications: Material: ABS Product Size(LxWxH): 18.5x5.7x3.5cm Package Contents: 1xDiamond Tester Pen 1xPU Leather Bag 1xTesting Platform 1xUser Manual Please note： Since this is a thermal conductivity mode to detect hardness, it will make a sound when touching any metal, which is normal. When testing, the probe needle and the tested object must be at a 90 angle. When testing diamond, your right index finger must keep touching the metal panel on the back of the tester without gloves. Due to manual measurement, there might be a tolerance in the product size. Due to the lighting effects and shooting angles, the color of the item and that shown in the picture might have a nuance. Moissanite Tester Pen: Moissanite tester pen is to distinguish synthetic diamond moissanite or natural diamond. Features: The moissanite tester is lightweight and