An ingenious solution to a difficult problem: The Sonic Crackometer, enabling its user to hear cracks over the sound of your coffee roaster, whether it is a BBQ Grill roaster, air roaster, or any other type for that matter.
You used the concept when you were a kid as a toy. However it is a toy no more. Its age old application has been reimagined and designed with special internal electronic components for use as a device to hear the cracks beans make over the noise your roaster makes! Patent Pending.