you need a paperclip and a ruler.bend the paperclip into a ushape.with the points of the u about 10 mm apart,touch your partner on the back of the hand with both points at the same time. can they feel one or two points? adjust the distance between the points and do the test again until you find the shortest distance where they can feel two points.write down the result and repeat on the other parts of the body listed in l to make it more difficult,sometimes touch your partner with just one point.