People used to describe size of any objects with the help of their hands. In order to gain accuracy and objectivity into the description now a unique Smart Finger is designed by Choi Hyong-Suk, Jung Ji-hye, and Yoo-Jin Park. There are pair of plastic tubes which you have to wear on your real fingers and measure the distance between themselves. A signal is sent between the devices and the time taken gives the distance. The distance is displayed on the side of one of the fingers. you can store it in memory for transfer to a PC. Currently it is just a concept.
Awesome! Use to measure easily.