Czech Metrology Institute (CMI), the NMI of Czech Republic has facilities and expertise in precision measurement of QHE, impedance measurements, DC and AC characterisation of the QHR, and in design and realisation of precision auxiliary electronic circuits. CMI participated in several European research projects related to precise resistance and impedance measurements (projects like EMRP JRPs SIB51 GraphOhm, and SIB 53 AIM QuTE, EMPIR JRP 18SIB07 GIQS). In this project, CMI will mainly contribute with their instruments and knowledge in AC measurements within WP2 and precision characterisation in WP3.