Using the infant arm circumference ruler and children's head circumference measuring tape is . Simply wrap the tape around the child's arm or head, ensuring it is snug but not too tight. Read the measurement where the tape meets the zero mark. These tools are great for parents and healthcare professionals who need to track growth patterns and identify any potential early on. Features -Color:Multi -Material:PP -Size:56.50X3.50X0.20cm/22.20X1.38X0.08in -Precise infant measurement: ensure accurate arm circumference measurements for infants, aiding in the tracking of their health and growth. - tool: this tape measure can be used for head circumference measurements, making it a versatile tool for parents. -Userfriendly: easytofollow instructions allow parents to perform measurements without professional assistance. -Multipurpose use: ideal for measuring head sizes, it can also be used for various cylindrical objects such as water bottles, hats, and more. -Shareable and portable: easy to store and share with friends or family, making it a practical tool for multiple users. Package list: 2 x baby head circumference rulers