How can I check the quality of bacterial primers and their specificity on blast? - (Feb/12/2015 )

I found in articles primers specific to different strains eg: Akkermancia muciniphila ,Bacteroides vulgatus... I noticed that many people still check these primers on blast to ensure their qualities and their specificities. Who can give me the steps to follow on to check primers on blast tool? I give you an example (Enterobacteriaceae)

EntF: 5'CATTGACGTTACCCGCAGAAGAA3'
EntR: 5'CGCTTGCACCCTCCGTATTA3'

Thanks