the invention of the present disposable adjustable lancet involves an assembly which has a body and a cap . a lancet holder fits in the body and has a base portion having a pair of upstanding retainer - disabling tines , one of the tines is longer than the other to block the reinsertion of the lancet . a selector tip assists in engaging a clicker position in the selector tip . the method involves selecting positions by means of a female and a male position clicker which provide an audible signal . the position of the lancet can be determined in three manners : visually observing the degree of rotation , audibly denoting the click , and physically rotating the member which , in turn , results in a reaction on the finger while the adjustment is being made .