[ngoma]

I have the same POP tester. Do you find it leaks at the valve stem?

For POP testing I like to use a tallish glass jar with a metal screw cap with a hole cut in the center of the cap. Hole large enough for the injector to sit in, so most of the fumes and spray droplets are contained in the jar, not my lungs. Still easy to see the spray pattern in the glass jar.

Jar not needed for testing for drips at just under POP pressure.