Are there enough candles, lanterns, flashlights, and other light sources to provide light so you can move around and read the instruments if the power goes out?
As mentioned before, electricity may fail in many locations due to a wide-scale nuclear attack. Most of the bomb shelters with the highest FPF’s will also have the least daylight reaching them. If the power goes out, these bomb shelters may be pitch black. Some light must be provided so people won’t get hurt when they try to move around.
You will need a light of some kind to read the radiological instruments. You should have your own flashlight or lantern so you can move around freely and read your instruments whenever necessary.