It's as simple as thatOur product has been specially designed to allow you to easily measure a part of the body. It's so simple you wonder how you ever got by without this device.Effective Just press a button and the soft vinyl tape conforms to your bodyand gives you an accurate measurement. Measuring biceps, forearm, thigh or calf becomes a breeze.You've got your coveredThey can measure up to 150 centimeters or 60 inches. The tape is marked in centimeters on one side and inches on the other side.Thecase is included in the measurement. To simplify the calculation, we imagine that the circumference of the arm is 38.1 cm. If the tape measure started at 0, the measurement would be about 33.02 cm (13 inches) since the intestinal part measures about5.08 cm (2 inches). .