This is an accessory for use with SafeAir Phosgene badge (Morphix Part# 382036-50). Badges are sold separately. This Color Comparator accessory can be used to determine phosgene 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 phosgene exposure dose from 0.5 – 450 ppm·minute.