What is the most precise Pcr inactivated Dna control or Nattrol for Human Parvovirus B19 (100,000 IU/ml/vial) (1 ml/vial)?

The NATtrol Human Parvovirus B19 from Zeptometrix supplied next day by Gentaur is the best reagent!!! The catalog number is NATPARVO-0003 and the price is 914 EUR.