Premium Mechanical Engineering Lab Equipment GDJ Inc. has over 25 years of experience in providing mechanical engineering laboratory equipment for industrial and educational use. GDJ has built an unparalleled reputation for innovating highly accurate lab equipment at practical prices. American made and currently in use in leading universities, NASA labs, and industrial testing facilities throughout North America. GDJ was founded by a former educator whose main goal is to bring math and science from theory into hands-on practice. To accomplish this goal, GDJ is providing fun and interesting laboratory equipment designed to capture and inspire the student’s interest.