Abstract: [Problem] To provide an antiseptic-solution concentration measuring method and equipment for easy, simple, economical and accurate measurement of the concentration of a glutaral, phtharal or similar antiseptic solution. [Means for Solving Problem] The temperature of the antiseptic solution S, such as the glutaral or phtharal solution, is measured by a thermometer, and at the same time the ultraviolet absorbance of the antiseptic solution is electrically detected by a light-receiving part 9, then a function of proportionality between the measured ultraviolet absorbance of the antiseptic solution and pre-measured ultraviolet absorbance of an undiluted antiseptic solution and a function of proportionality between the ultraviolet absorbance and concentration of said undiluted antiseptic solution are calculated by a computer to measure the concentration of the antiseptic solution S.

Abstract: In a cutting tool attaching and detaching apparatus of an ultrasonic vibration machining device, there are provided a collet attaching device and a collet removing device which can be separated from a shank and a collet.