If consumers find flat beer when they open their bottles, brewery sales and brand reputation will almost surely decline.  To minimize the number of low pressure (flat) bottles reaching consumers, major breweries in Latin America and around the world have chosen an acoustic on-line inspection system manufactured by U. S. company TapTone. The TapTone II system checks seal integrity at speeds up to 700 bottles per minute, identifying and rejecting those whose pressure falls below acceptable limits.