This uv testing is perfect for those who enjoy outdoor activities. The uv color-changing is a unique feature that allows you to easily use. The anti-uv detection test is a practical tool, sufficient for use, you can easily share them with friends and family. Features -Color:Violet -Material:Plastic -Size:2.70X2.70X0.10cm/1.06X1.06X0.04in -Unique uv color-changing use for uv testing, and then allowing you to take appropriate measures to protect skin. -Scientific anti-uv detection test , accurately detects and measures the level of uv radiation, -Sufficient for use, and great for sharing with friends and family. You can send it as a practical present for your family or friends. -Perfect for outdoor activities such as hiking and camping: Ideal for outdoor enthusiasts engaging in activities. -These uv testing are basic, reliable and simple method of monitoring uv strength. Package list: 20 x uv testing