Click Show primers details for seeing statistic details about primers. 
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  <img src="/wiki/download/attachments/13435071/Primers Details.png"/>
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The following dialog will appear:

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  <img src="/wiki/download/attachments/13435071/Primers Details_1.png"/>
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This is a dialog with statistic details about primers: melting temperature, GC content, dimers, self-dimers, etc. If a value is not correct for its criteria then it is colored in red.