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This is an accessory for use with SafeAir TDI/MDI badge (Morphix Part# 382001-50), which detects Aromatic Isocyanates. Badges are sold separately. This Color Comparator accessory can be used to determine toluene diisocyanate (TDI) exposure dose by matching the color on the badge to a color on the comparator. The comparator is a specially designed color chart which features a slot for inserting a badge. Once the badge is inserted, the user can turn a wheel to match the color on the badge to the comparator, and the corresponding exposure dose is indicated in the exposure dose window. The comparator measures toluene diisocyanate (TDI) exposure dose from 5 – 140 ppb·hr.