Accurate electronic measurement of TPI and TPM for S and Z twist Yarns. Silent DC motor with stepless adjustment from 200 to 2000 RPM. Specimen length adjustment from 0 to 20 inch(50 cm). Minimum number of control switches for easy operation. Results can be seen in the LED display unit. Auto stop after completion of test. Suitable for single, double and OE yarns. The Statex invented twin tensioner makes it possible to apply variable tension for single yarn and constant tension for ply yarn from one single tensioning device.