The size tag is affixed to the inside of the mask. Breathe out and open the eyes. Make sure it works. Immediately report any malfunction. Make sure your mask is clean at all times.
First aid is also to be used against nerve agents.
Make sure to have the kit in your possession along with the mask no matter where you are and make sure to use it efficiently. Except in real use, it is prohibited to tamper with the Atropine needle or to remove it from its cover lest the spring is released. There is no reason for concern about the use of toxic chemical agents if the protective gear is being utilized in the right manner and in accordance with the directions and at the right time. Do not press the content of the balm and keep it in the mask case along with the sterilization and individual first aid kit. The chemical protection gear is personal and you better train on its use.