This training manual introduces inexperienced personnel to the basic procedures, standards, and instruments used to measure oil and gas. It is intended as a primer for both those who measure oil and gas and those who witness measurement procedures. It can be used as an introduction for people new to the industry or as a reference for those knowledgeable about other areas of the industry but unfamiliar with measurement procedures and practices. Topics include: Tank measurement Gauging petroleum and petroleum product heights in stationary tanks Measuring the temperature, density, and suspended S and W content of liquids in tanks Manual sampling of petroleum and petroleum products Automatic sampling of petroleum and petroleum products An introduction to LACT systems Meters and meter proving Orifice meter installations