Biosensor is used to measure? A) Blood glucose level B) The body pH value C) Amount of hemoglobin D) None of these Related MCQs: ……. describes the events to which we measure what we purpose to measure? ……. Validity is the extent to which a tool appears to measure what it is supposed to measure? A type of criterion validity whereby a new measure correlates with a criterion measure taken at the same time is considered. The ability of a scale or measuring instrument to measure what it is intended to measure is called?