Large, yellow, hand-held, remote thing!

PUBLIC HEALTH ENGLAND / SCIENCE PHOTO LIBRARY

The device in the photos is a selective radiation meter (SRM), specifically a Narda SRM.

Here's what it does:

1. Checks Safety: It measures invisible energy waves, like those from power lines, to make sure they're safe for people.
2. Portable Gadget: It's a handy, portable tool that experts can carry around to different places to check these energy levels.
3. Protects Health: By measuring these energy waves, it helps make sure that places like schools, hospitals, airports, electricity substations, etc. are safe from too much radiation.
4. Environmental Watchdog: It also helps scientists keep an eye on how this invisible energy might be affecting nature and the environment.

So, the next time you see someone using a device that looks like a futuristic gadget, they're likely ensuring that the invisible waves around us aren't causing any harm!