Describe the the feature you'd like
A Nuclear Meter for use to calculate nuclear gas in the air nearby player

Describe alternatives you've considered
The Nuclear Meter will:

1. measure the nuclear gas in the air surrounding using the vanilla clock mechanic. Stand closer the where place have radiation the clock will spin to the red side, place have less radioactive will spin to green side more
   It also can be calculated how much radioactive in the air by print it to the (Tier 2) meter the number which will turns red if it have the most radioactive and turn less when radioactive level decrease

2. If there is no radioactive the meter will said "No Radioactive" in the actionbar

Additional context
None

There is already such a thing, is called Geiger counter, there is also another version which calculates if the player is affected by radiation

As robball said this is already basically a thing