The O2 meter at the STEM lab is inoperante. We are now using a small hand size backup O2 sensor (see picture) in the STEM lab. It’s on the window stool.
If it reads 24 it means the oxygen level is normal.
Please, do not remove this oxygen sensor out from the lab, and leave it next to the window so it’s visible from outside.
If it flashes and beeps please leave the room and let me know or ACMAL staff know.