Why no dl a dbtest from your phone app store for free. Sure they are not the best and every phone brand/model will record a little measure a different db. Why not also inclue your phone brand, model and which db app u used? The idea of free anything will hopefully get more people to participate = better survey.
So make a standard as far as recording distance, facing x way, rev to x rpm, in front of left exhaust, in open lot, in garage or whatever.
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