Neutral Density Filter 1-Q-20 EPA Method - 243_2 -
Neutral Density Filter 1-Q-20 EPA Method - 243_2 -The neutral density filter is used to perform absorbance accuracy test of spectrophotometers. The filter is made to measure 0. 50 absorbancy and is designed to fit into a standard slide plate holder. Part Number: BS 186 0450
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