... : use different types of hammer (different energy/material) for different types of piles (lengths, etc.)Features: Large touch screen ... max. wave velocity, avg. wave velocity, numbers of piles of type Ⅰ,Ⅱ,Ⅲ, etc., and can generate a comprehensive excel format table. ... smoothing, differential, filtering, power exponent, linear amplifier, etc., amplitude spectrum or power spectrum analysis is also ...