An alternating current impedance-estimating section estimates an alternating current impedance of the secondary battery based on electric current and voltage of the secondary battery detected when a ripple generating section causes a ripple current to flow in the secondary battery. In a preferred embodiment, negative pressure and resulting air flow is provided at a lower blade guard to capture particulate matter as a byproduct of cutting a work piece. This MEMS process can mass-produce the sensors on silicon substrate in the ways of small size, low power, and high reliability. Therefore, when a compression force is applied on the solution container, the solution is released to the brush member through the dispensing channel of the nozzle head. The weight is attached to the lower end of the hollow cylinder with a watertight seal.