. The card contains UVB color test strips, which can detect the UVB strength in the environment. Compact size for easy storage. Ideal for reptile owners. Reusable for detecting outdoor UVB levels; intended for use with the card only. Type: UVB Test Card Size: 8.4 x 5.3 cm Material: PVC Package Contents: 10 x UV Test Card Note: The package includes only the items listed above. Other products are not included. Lighting and display settings may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm. Instructions for Use: Low levels of ultraviolet radiation are not harmful and do not require protection. UV exposure at medium levels and above can damage skin and eyes and requires protective measures. This card is made from UV-sensitive materials that react only to ultraviolet light; visible light does not affect it. Place the UV-sensitive area of the card under sunlightthe stronger the UV intensity, the darker the color change. This card is designed to test UV intensity in sunlight and can also help assess the effectiveness of UV-protective products. The card is reusable and serves as a helpful tool for outdoor activities, travel, and sun protection.