Unit for Interlaboratory Comparisons Unit for Interlaboratory Comparisons is engaged in the proficiency testing / interlaboratory comparisons. The Unit for Interlaboratory Comparisons was established by the project SPOWKP/1.1.2/183/032 Development and implementation of a system for laboratory comparisons of electrical quantities in Poland Unit for Interlaboratory Comparisons. This is the first accredited by the Polish Centre for Accreditation player in the organization and conduct interlaboratory comparison programs in the field of electrical quantities DC and LF.