It was time to get the customer on the list to get their fire extinguishers serviced. I called and the customer scheduled. I put them on today's schedule. I arrived and checked each fire extinguisher for damage and services that need to be done. I found 5 needed to be hydrotested. I did a swap out for those fire extinguishers. I then found 4 more that ne3eded to have maintenance done. I did those on site. They also needed a single new 5lb ABC fire extinguisher. I sold them one of those also. I did each annual inspection and billed the customer out.