wrote:
Commercial grade fire extinguishers are required to be inspected by a
licensed inspector annually. They require a 6 year maintenance and a 12
year hydro test. Any dry chemical FE manufactured prior to October 1984
should be replaced as these FE's no longer meet current code standards.
You NEVER want to just squeeze the lever a little bit to see if they
still work because doing so will slowly release all the explant gas and
render the FE useless when you later might need it. If there is no
visual damage to the unit, the gauge is in the green, the hose is
unobstructed, you can weigh the FE and make sure it's gross weight is
within the range on the label.
Most home use FE's are a one-time use FE that CANNOT be serviced or
recharged and should be replaced every 12 years.
When it comes to fire safety, all it takes is one time. If the fire is
small enough to put out with your FE, a catastrophe can easily be
avoided. The cost of a couple FE's for your home or business is a small
price to pay. If the fire is too big, leave it to the fire department and save your life.

I was just moving things, looking at an extinguisher. Took it out back and
sprayed. Shoots out a strong stream of liquid. Not for electrical it says.
I'm not going to squirt it at a grease stove fire. AB rated. No guage

Greg