Bob was working at his machine and grabbed for his calipers to check the distance on his hole locations. He accidentally pushed the calipers off the machine and they landed on the floor next to his feet. He picked them up and looked them over very carefully. But he noticed that they were not working right. He told his boss he needed to run over to the aircraft tool supply store and buy another set of calipers so that he could finish his job. He went to the shop and bought another pair right away. He is glad that the store is not far away from work.