The results of additional comparisons of the national standards of the unit of the harmonic coefficient of Russia (VNIIFTRI) and the Republic of Belarus (BelGIM) are presented. A mass-produced harmonic coefficient meter was used as a reference carrier. The differences between the harmonic coefficient unit reproduced by national standards the reference values do not exceed the extended uncertainty for all measured values of the harmonic coefficient and at all frequencies. Thus, the measurement and calibration capabilities of the laboratories participating in the comparisons are confirmed.