Brand: UVB Test Card The card contains UVB color test strips that can detect the UVB strength of environmental conditions. Compact and easy to store, it is ideal for reptile owners. Reusable for detecting outdoor UVB levels or testing UVB exposure on the card only. Type: UVB Test Card Size: 8.4 x 5.3 cm Material: PVC Package Contents: 10 x UV Test Cards Note: Other products are not included. Lighting and different displays may cause slight variations in the color of the item in the picture compared to the actual product. Measurement error allowed is +/- 1-3 cm. Instructions for Use: Weak ultraviolet rays do not harm the human body and require no protection. Ultraviolet rays above medium intensity may damage skin and eyes and require protection. This card is made of ultraviolet-sensitive color-changing material that reacts only to ultraviolet rays; visible light has no effect. Place the UV-sensitive area of the card in direct sunlight—the stronger the UV, the darker the color change. This card is designed to test the intensity of ultraviolet rays in sunlight and can also be used to evaluate the effectiveness of anti-ultraviolet products. It is reusable and serves as a helpful tool for outdoor activities, travel, and sun protection.