Bulk strain solitons in solids attract considerable attention in applications due to their very small decay, permanent bell shape and the wave parameter dependence on waveguide elasticity and geometry. One of the reasons of an evident gap between theory and numerical simulation of strain solitons propagation in various waveguides and comparatively rare experimental verification of rigorous results lies in extensive variability of physical constants data available for polymers. We show how a dramatic improvement of experimental setup provides new opportunities in solitary wave observation and its parameters measurements. Digital holography based on high-speed registration cameras allowed us to refine the accuracy of measurements, and precise pulse synchronization provided direct measurements of bulk strain soliton velocity with proper accuracy. It confirms the fact that the soliton parameters depend rather on the waveguide geometry and material, not on an initial pulse, which power provides either a single soliton or a soliton train. (C) 2016 Elsevier B.V. All rights reserved.