neutral filter

neutral filter

[′nü·trəl ′fil·tər]
References in periodicals archive ?
Kit lenses SPAR-1 and a set of fields for verification Autoceratorefractometers or equivalent - 2 sets; set of interference filters for calibration of radiometers in the ultraviolet region of the spectrum - 2 sets; set of plates for testing refractometers - 2 sets; set filters for calibration photoelectric - 1 set; set of neutral filters for calibration of spectrophotometers in the visible region of the spectrum - 1 set; set of neutral filters for calibration of spectrophotometers in sleep spectrum - 2 sets; set of measures ferritic phase - 1komplekt; digital temperature calibrator RTC-700B or equivalent - 1 unit .