Portable DNA tester are coming. NEC manufactured the first one in 2007. New versions of the product have been released each year since then. I couldn't find the price though.

Other companies like Spartanbio followed suit the same year. Five years ago, the Spartan DC Personal DNA Analyzer was selling for $15,000, and according to the article could perform on-demand applications, such as paternity tests, in only 30 minutes. It surely costs a lot less now, although the pricing information is missing.

Any additional information on the subject is heartily welcomed.