This Gulf standard specifies metrological and other requirements for oscillation-type density meters which are used in laboratories for all kinds of homogeneous fluid samples. In addition, a method for adjustment and calibration of laboratory instruments is given. The instruments are either standalone units or part of more complex measuring equipment supplying additional test parameters of the sample. This standard does not describe the method of use of density meters for particular applications or products such as petroleum products or beverages. Such methods of use can be defined by relevant institutions such as GCC or responsible government agencies. This standard does not define an instrument specification for any particular applications. For this information reference should be made to the relevant standard covering the method of use. This standard is addressed to manufacturers of density meters and to bodies testing and certifying the conformity of density meters. In addition, this standard gives recommendations for adjustment and calibration of density meters by the user.