In the paper the Author pointed out, that the major number of the Particulate Mater in the exhaust gas of engines riches the sizes of less than 0.1 μm. For the better determination of the PM diameter distribution the Horiba enterprise has proposed new metering method of the gravimetric type named TEOM. In the metering system a set of fi lters with different fl ow capacity has been applied. The mass of Particulate Metter hold-up on every filter is being determined by the analysis of the filter vibration frequency. The presented method allows the measurements of the PM-mass with the accuracy of 0.01 mg up to few grams.