The measurement range of the LV-1710/ LV-1720A is expressed in the tripartite graph of four axes, three elements (displacement/ velocity/ acceleration) of vibration and frequency. For the structure, if any two values of four (frequency (Hz), displacement (m), velocity (m/s) or acceleration (m/s²)) of the measurement objects are known, it is possible to obtain the rest of two values. When the cross point of two known values is within the measurement range of each models, it is possible to determine that the models are available.