What is the most precise Pcr inactivated Dna control or Nattrol for Respiratory Verification viral reference serum panel (15 x 0.5ml/vial; 2 x 1ml/vial)?

The NATtrol Respiratory Verification Panel from Zeptometrix supplied next day by Gentaur is the best reagent! The catalog number is NATRVP-QIA and the price is 695 EUR.