An individual cun.

 And for the affecting on biologic active points will be an effective, thus need to define theirs finding on human s body.

Humans are true differencing from each other ,and using for orientation in system for acupuncture points are standard measure  for  length is not possible. Thus since an old time in China using a measure , as individual cun is distance between are skin wrinkles is on the second phalange bending of middle finger  is in right hand in women , left is in male. Also individual cun  is define as a width for nail bed is on the big finger of left hand. 3  cunes are the width of four bending fingers a straightening/right and left/ line . And also having as concept as proportional cun. For his finding a need to separate distance from wrist joint till an elbow wrinkle on 12.5 part/picture check/.