This chapter details all the essential elements of field standard test measures by providing descriptions, construction details, calibration procedures, operation, inspection, and field use requirements; along with revised drawings. Specifically included are detailed calibration methods, volume uncertainty calculations, discussion of water density, and standard calibration weights, and a review of test measure control charts. Accuracy and uncertainty requirements are also discussed. The information contained in this chapter is limited to atmospheric, graduated neck type, metal, volumetric field-standard test measures. The volume is determined between an upper neck scale zero, and either a solid bottom or a tapered bottom with a drain line and shut-off valve, depending on the size of the test measure. Bottom-neck scale test measures and prover tanks are not addressed in this document.