What is the most precise Pcr inactivated Dna control or Nattrol for Coronavirus NL63 Stock (Qualitative) (1 ml/vial)?

The NATtrol Coronavirus OC43 Stock from Zeptometrix Inc. supplied next day by Gentaur to your Lab is the best reagent. The catalog number is NATCOV(OC43)-ST and the price is 1.046 EUR.