An acidic cleaning composition designed to clean hard surfaces and to prevent soil build-up comprising a hydrophilizing polymer, a surfactant, and an acid and to methods of using the composition to remove limescale andor soapscum. Estimated matching quality information is calculated which indicates the degree of matching between estimated quality information and quality information of the actually input biometric information. The clocking circuit configured to provide the pull-up current to an internal node in response to a clock signal having the input supply voltage and the ground voltage. Terminal probes have contoured tips. Thus, freedom of supplying the molten metal flakes can be efficiently produced. The structure according to the invention is relatively small and reliable, and its manufacturing costs are low.