A multi-functional screwdriver including a shaft forming a pair of coplanar bends rotatably mounted to a handle having therein a compartment for storing a plurality of bits is disclosed. A type judgement electrode is provided separately from a positive electrode and a negative electrode in a measuring apparatus so as to judge the type of a set test strip with the measuring apparatus. The apparatus also includes a storage section to store the predetermined ideal value of the signal value. The first and second links are movable to move the wheels between the first and second positions. Thus, a disk drive and a beam angle adjusting structure preventing adjusting screws from jolts can be obtained without increasing the number of components.