Vibrometers and tachometers are measuring tools and measuring instruments used in a wide range of applications, such as measurement and monitoring of various machines and devices, impact tests, balance correction, etc. There are different types of vibrations, such as linear vibration, bending vibration, torsional vibration, etc. Vibrometers include those that constantly monitor mechanical vibration in power plants, production facilities, etc. and those that are portable for the purpose of facility diagnosis. Select according to the purpose of use, such as the balancing function,recording data on the SD card, etc. Tachometers include tachometers that measure the rotation speed of machines and inspection machines, non-contact stroboscopes that measure rotating objects, etc. such as motors, fans, etc. It is necessary to select the most suitable measuring instrument according to the application.