You are questioning the instrument's "validity ".
Validity is the degree to which a concept, end or estimation is very much established and likely compares precisely to this present reality in view of likelihood. "Valid" is gotten from the Latin validus, which means solid. This ought not be mistaken for thoughts of assurance nor need. The legitimacy of an estimation device (for instance, a test in instruction) is thought to be the level of likelihood to which the device estimates what it professes to gauge; for this situation, the legitimacy is a proportional to a percent of how precisely the claim relates to the real world.