This form has been simplified from the original one available here.

The service will search for 15-21 mers primers pairs (optimum size: 18) yielding PCR products withing the range 150-250 bp (first option) or witin the following ranges (sorted by preference): 100-300, 301-400, 401-500, 501-600, 601-700, 701-850, 851-1000.
Default Tm of primers: 57-63 C