This is a Geiger counter for detecting radioactivity.
5 seconds sound clip from the The War of the Worlds (1953) movie soundboard.
You can hear this line at 00:10:51 in the DVD version of the movie.
Quote context
[...]
- My uncle, Dr. Matthew Collins, pastor of the community church.
- Well, I... How do you do, Dr. Forrester?
- What you got in here, fella? Ticking like a bomb.
- This is a Geiger counter for detecting radioactivity.
- We did a little bit of surveying while we were up in the hills.
- Yes. Difficult to account for a reaction like that.
- Look at this thing. It's going crazy.
[...]