A switch includes an N-shaped spring which is connected between an inside of the base of the switch and an end of a bimetal plate. The lancet device includes a body and a lancet, the lancet being movable between a retracted position in which the lancet tip is disposed within the body and an extended position in which the lancet tip extends beyond the body. A member for marking the position of the switching element is disposed on the conversion element. Examples of the cost include cost for size of required storage area, and cost for required operation of CPU.