Feature: 1. [10 Pcs Set] This set includes 10 double-sided black laser testing papers measuring 210 x 285mm (8.3 x 11.2 inches), providing a sufficient supply for testing requirements. 2. [Dual-Sided Usage] The black laser marking test paper is designed for use on both sides, enabling efficient testing of laser equipment. 3. [Clear Laser Printing Area] The test paper features a white printing area with well-defined spot edges, allowing for easy evaluation and analysis. 4. [Wide Applications] Compatible with semiconductor laser marking machines, fiber laser marking machines, laser cutting machines, UV laser marking machines, and laser beauty equipment. 5. [Versatile Usage] Suitable for adjusting performance and spot quality of laser marking, welding, and cutting machines, as well as for testing spot alignment and energy output in laser beauty devices and similar equipment. Specification: Item Type: Laser Testing Paper Material: Paper Color: Black Size: Approximately 210 x 285mm / 8.3 x 11.2 inches Package List: 10 x Laser Testing Paper Note: Double-sided black laser engraving test paper is suitable for laser welding and laser cutting machines with power ranging from 2W to 500W. Sensitivity increases with higher power levels. The test paper will show marks only when the laser is active. For devices with higher power output, begin testing at low power settings and gradually increase to achieve optimal results, preventing damage caused by excessive power that may pierce the paper.