With an objective of providing wind instrument makers with design and simulation tools, many methods for both characterization and simulation of the behavior of acoustic properties have been developed. Some of these tools are made available to makers via softwares and devices. In parallel with a benchmark of numerical approaches for their verification, an experimental campaign is presented here in order to create a reference database for the validation of models, and to estimate the uncertainties associated with the measurements. In particular, the random inter / intra sample uncertainty is quantified. The experimental campaign is based on batches of five specimens each. The experimental plan allows to obtain consolidated experimental results concerning materials and making processes. The specimens produced are tested in different laboratories with varying characterization methods. The campaigns that took place defined a measurement protocol and evaluated biases and irreducible uncertainties. These measurements give first estimates of the variability of the results and provide precision thresholds of modifications to be significantly measured.