To measure the number and stability of interlaces on POY, FDY and DTY Textechno developed the new Interlace Tester ITEMAT+ TSI. The instrument is the legal successor of the well-known ITEMAT by Enka Tecnica. While the basic principle was kept the same, drives and electronics were replaced by state-of-the-art technology. The mechanical interlace sensor has been completely re-designed to cover a larger linear-density range at better reproducibility. The ITEMAT+ is available either in a single housing or in a multi-position cabinet which may contain up to 5 testing units.