Objective The authors measured and analysed body height and finger distance in 229 young people, Including 117 males and 112 females of Xibo nationality in Xinjiang.

The Smart Finger actually uses two fingers. The pair of plastic tubes slip over your real fingers and measure the distance between themselves.

Well, going bigger actually doesn’t increase performance and accuracy, and can actually slow the user down because the finger has to move a greater distance with each touch.