Over the past 45 years, the author has pursued troubleshooting machinery and pressure vessels. It has also been the subject of this column. The troubleshooting tools used in this endeavor have been analytical modeling, along with problem-solving methods. When employed by large companies, I had open access to metallurgical laboratories, and I worked directly with very talented engineers and technicians of the company. When I retired and began a consulting practice, I no longer had access to those services and had to use contracted laboratories. To expedite model development for my clients, I purchased equipment that has allowed me to do a certain level of material evaluation with confidence.