In the CCUS industry, flow meters are widely used to measure liquid CO2 flowrate for custody transfer, emissions requirements and process monitoring and control in the loading/unloading of ships and trucks. Flow meters require calibration to accurately measure the mass or volume flowrate in the pipeline. This report first summarizes the current state of the art in traceable liquid CO2 flow measurement, making use of existing datasets on calibration facilities, liquid CO2 flow meters, and their calibration (transferability). This is then followed by a description of conceptual designs of test facilities for calibration of liquid/dense/supercritical CO2 flow meters, including an overview of operational and accuracy requirements, followed by chapters on test facility estimated calibration uncertainty and operational considerations