title: Barcode number checking with Excel
body: <p>I have a problem to solve. I scanned 500 barcodes (barcode numbers Excel), which are placed in column A. Now I want to check if the barcode that a given customer returned to me is one of the 500 barcodes scanned before.</p>
  
  <p>Any suggestions?</p>
  
  <p>Thanks for the help.</p>
  
  <p>Munix</p>