You can resolve DNA fragments, PCR, and RT-PCR products, differing in size by 2%, in the range of 200 bp to 800 bp. For example, separate a 200 bp DNA fragment from a 204 bp fragment.
MetaPhor agarose gels of 2-4% approximate the resolution of 4-8% polyacrylamide gels. These agarose gels resolve AMPFLPs, STRs, and tri- and tetranucleotide repeats. Fast-running protocols can be used, in which DNA differing in size by 1% can be resolved in as little as 1.5 hours in a 20 cm long horizontal or vertical gel format.