The measurement ID is more or less the same as the tracking ID for the new Google Analytics 4. If you use a Google Analytics 4 property, your UA ID becomes a G ID ("Measurement" ID; also called measurement ID). However, finding this is easy. To do this, go to the property column of your Analytics interfaces - as with the tracking ID. After you have selected the correct property, click on Data Streams. Select the correct string. At the top right you will now find the "G" ID. The ID is displayed in the pattern G-XXXXXXX.