an instrument for measuring the intensity of light in a certain place or upon a certain object, having an adjustable scale for determining the optimum relations of shutter speeds and stops at each intensity.
The camera and exposure meter are on top of the microscope.
The control for the exposure meter is between the microscope and the automatic point-counter keyboard in the left background.
British Dictionary definitions for exposure meter
(photog) an instrument for measuring the intensity of light, usually by means of a photocell, so that the suitable camera settings of shutter speed and f-number (or lens aperture) can be determined Also called light meter