The apparatus and method of the present invention provide a quick, simple and accurate manner in which to measure the dimensions or characteristics of a hole without contacting the hole. One such device includes circuitry operable to provide a media access control interface. When the up-down counters are simultaneously started by method of a count start signal output from a CPU, the respective up-down counters start counting operations from the respective initial values, perform cumulative subtraction until the count value reaches an upper limit, and perform cumulative addition until the count value reaches a lower limit. The curable composition is coated on fiberglass and thereafter is cured to form a secure binder. The protrusions increase the distance between the lamps and the receiving member.