A comparison on scattering coefficients with Type N connectors was planned among the partners of the EPM (European Partnership on Metrology) project. This inter-laboratory comparison exercise was part of the project “Development of RF and Microwave Metrology Capability II” (22RPT04 ‘RFMicrowave2’), under Work Package (WP) 1.3 titled “Reflection and transmission coefficients (S-parameters) and attenuation measurement”. The comparison was planned for three participants (TÜBİTAK UME, IMBIH and SIQ) involved in WP 1.3 of “22RPT04 RFMicrowave2” Project. The comparison was conducted in accordance with the Technical Protocol prepared by TÜBİTAK UME and approved by the participants. SPARK provided the attenuator for the comparison. The comparison was carried out by measuring the S-parameters at eight frequencies which were 50 MHz, 500 MHz, 1 GHz, 2 GHz, 3 GHz, 10 GHz, 15 GHz, and 18 GHz. IMBIH and TÜBİTAK was responsible for analyzing and reporting the results of the comparison, respectively.