Abstract: The flow meter for measurement of pipeline crude oil must operate within the range of error as specified. For metering precision and accuracy at shift time, a standard volumatric pipe is mostly used at present to prove flow meters in use perio-dically. Such device is of good repeatability and high accuracy which make it fit for larger pump stations. Putting under consideration such factors as its cost of installation, frequency of use, pernonnel management and assurance of metering accuracy, the article makes a few suggestions as to providing standard flow meters of high accuracy for medium and small crude oil metering stations which have not yet had fixed standard volumetric so far. Also covered in the article are selection and proving of standard flow meters. and how to use them to prove the flow meters on line.