absolute instrument

absolute instrument

[′ab·sə‚lüt ′in·strə·mənt]
(engineering)
An instrument which measures a quantity (such as pressure or temperature) in absolute units by means of simple physical measurements on the instrument.
References in periodicals archive ?
Indeed, a free media is also an absolute instrument of civil control," she added.
Free election, real political competition are the absolute instruments of civil control," she said.
The Absolute Instrument Calibration, combined with the algorithms of the proprietary Living Image software allow for images measured in relative light units (CCD camera counts) to be converted into quantitative, calibrated data measurements of the photon emission from the subject in absolute physical light units of surface radiance expressed as photons/s/sr/cm2.
In contrast to the launched WMAP satellite, the PLANCK satellite will have on board absolute instruments which will not be able to detect the measured temperature of the Cosmic Microwave Background.