What are these EnTeck jewelry magnifiers used for? The dual LED jewelry pocket magnifier is made of high quality optical glass in a chrome plated surround. Great glasses lupe for watch repairing, specially for inspecting those tiny parts. Such as inspection of jewelry, diamond, coins, stamps and antiques, precision detecting of insects and disease on farm plants, cellphone pcb, mini circuit checking and repairing, gardening maintenance, hydroponics Specification: Material: Aluminum alloy cover, ABS frame, optical glass lens Magnification:30X, 60X Two Lens: Primary lens: 30x22mm Supplementary lens: 60x12mm Size: about 45x35x20mm Color: Sliver Net Weight: 35g Illumination: LED light Push Switch to Turn On/Off/On two LED light Power Supply: 3 x LR1130 batteries (batteries Include) Features: 1. Optical glass lens provides clear view field 2. Jewelry lupe with 2 bright led light provide sufficient light at any condition. They can be used as a mini torch at night 3. UV lamp can be used as money checker 4. Folding metal cover protects lens 5. Coin size is convenient to carry and use anywhere How to replace the battery? Replacement of batteries: Inset the key attached to this product into the two holes of battery cover, turn anticlockwise to loosen battery cover, take out the old batteries and then put the new batteries inside, finally turn the cover board clockwise to tighten it. Package Included: 1 * Pocket Magnifier 1 * English User manual