1. The product. Are they making a product that has a market? They can make the best iron pipe fittings in the world, but if every body is using plastic pipe fittings, that company is not long for this world. 2. Customer base. Is 90% of their business generated by a single customer?? Stay clear! If that company would have financial difficulty, it could wreck the best companies.and if it were to lose that customer, lights out! 3. Debt to equity. Is the co heavy with long term debt, and are accounts payable current? Then, the co has adequate cash flow to pay its bills. 4. Legal issues. Not necessarily lawsuits, but are they disposing of waste in a questionable manner? Is their facility surrounded by fields that are giving way to housing developments? true, the co was there first, but all it takes in one person buying a new house who is going to complain about heavy trucks going in and out of your property. 4. Are their workers represented by a Union. Non union work forces are more flexible. 5. ifs there room for future expansion? There are others, but these , to me, are very important.
If you are speaking of one of the small 5, or 10 pound extinguishers, just go to Home Depot or Lowes. They are not that expensive. It would cost more to have that one recharged, if it is possible to even do so.