If you didn't want to send it to one of the testers you can mail it to (crossfire, hydrotester.com , etc), then I would go see a local fire extinguisher business. They can probably test tthemselves, or will certainly know someone local who does.
My oldschool PBN Feedback +48 Positive/ZERO negative : before the days of this "fancy" feedback system.
"When people get a little too chummy with me
I like to call them by the wrong name
to let them know I donít really care about them."