Which instrument is used to measure height of aircraft above ground? A) Altimeter B) Hydrometer C Tachometer D) Altitude Meter Related MCQs: The ability of a scale or measuring instrument to measure what it is intended to measure is called? A horse runs around a ground twice covers a distance of 8 km, one side of square ground is? Which instrument is used to measure pressure? Which instrument is used to measure humidity in air?