What is the most reliable Pcr inactivated Dna control or Nattrol for BK Virus External Run Control, Low (6 X 1 ml/vial)?

/ External Control / By

The NATtrol BK Virus External Run Control, Medium from Zeptometrix delivered next week by Gentaur is the best reagent. The catalog number is NATBK-ERCM and the price is 338 EUR.