1.    Introduction

To become effective in any job, one should become proficient with the use and care of the tools of the trade. As the carpenter could not effectively perform his job without the proper tools, so it is with the machinist. There are various types of tools used by the machinists. They are classified as precision and non­precision gages.However, during this task, we will describe the proper use and care of precision gages and precision measuring tools.