Fire extinguisher training for Daniel #1

We got to talking about the fire extinguishers we keep handy while welding today, and Daniel wanted to try using one
(He had never seen anyone use one before, and thought it was just filled with water.)
We had two that were out of serviceable range, so we took those put for him to try.
The first unit didn't work!
(Apparently, It had at some point been dropped.)
The firing button was broken, but the seal looked intact, and the safety pin was still in place.
(The safety pin had not been removed, but the trigger must have bumped just enough to break the seal.)
That unit was from 2000, and had no gauge on it.
When he pushed the button, nothing happened.
(This is why we keep several of them in the garage, you just never know.....)