Mechanical engineers research, design, develop and test mechanical and thermal devices including tools, engines, and machines. Some of the more-common devices serve the medical, energy, and automated manufacturing sectors. Many mechanical engineers work in general-purpose and automotive manufacturing, or for architectural and engineering service companies. Mechanical engineers also work in research and development testing laboratories. They typically spend their workdays in professional office settings but sometimes visit work sites to solve problems with existing equipment.Mechanical engineers work hard, and often put in long days. According to the BLS, more than one-third of mechanical engineers worked over 40 hours a week in 2012. Candidates who continue their education to keep abreast of technological innovations will likely fill the best jobs opening up in the field.