ochrometer

An instrument for determining the capillary blood pressure; one of two adjacent fingers is compressed by a rubber balloon until blanching of the skin occurs, after which the force necessary to accomplish this color change is read in millimeters of mercury. [G. ochros, pale yellow, + metron, measure]

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ochrom·e·ter (o-kromґə-tər) [Gr. ōchros pale + -meter] an instrument for measuring the capillary blood pressure by registering the force necessary to compress a finger by a rubber balloon until blanching of the skin occurs.