Jag, I've been using a Radio Shack dB meter (made in China for them) since the '80s. This is the same $29 meter the CHP uses (or used to use, as well as Laguna Seca and Sears Point). Tracks will black flag you for excessive noise and if you argue, will bar you from future entry so its good to know if you're marginal. Radio Shack is no longer around but a quick Google search finds dozens of substitutes. There's even an app for smart phones to download a dB meter. No excuses any more!
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