The worth and performance of a vibration insulating bench-top, used with a precision machinery, depend on how much vibration can be removed with it. In this example, the VR-6100 is used to compare vibration on a floor and a vibration insulating bench-top, and evaluate its performance including insulation effect. The frequency range for evaluation is generally from 0.5 to 200 Hz. Our original method of LvF measurement (0.7 to 355Hz) mode enables an evaluation with high accuracy.