Pipbuck has a geiger counter

A voice was filled with a terrible resignation, as if the pony had already given up hope and was just going through the motions. Shaken, I turned it off. I didn’t think I could bear to hear it again. That is when I noticed the soft ticking from my PipBuck. Checking it over, I discovered that its radiation detector -- a feature I had never known to be used, had self-activated. The cute little rainbow dial had always been planted firmly in the green. It was still there, but edging discreetly towards the yellow.