unchallengeable (oh) and reagent kits, diagnostic (medicine)

unchallengeable (oh)

a belief, idea etc that is unchallengeable is definitely true and cannot be questioned or argued with
::unchallengeable evidence
if someone's power or authority is unchallengeable, it cannot be taken from them

reagent kits, diagnostic (medicine)

reagent kits, diagnostic

Commercially prepared reagent sets, with accessory devices, containing all of the major components and literature necessary to perform one or more designated diagnostic tests or procedures. They may be for laboratory or personal use.

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