SPS supply a wide range of tension sensors as spares or replacements for many textile machines and processes; please contact sales with your specific requirements for a competitive quote.  SPS offer the Fibrevision Unitens 4 Sensor which is a direct fully compatible replacement for the Barmag Unitens 3 sensor and is suitable for use as individual replacements or complete machine replacements.    The Unitens 4 sensor uses the same zero and calibration techniques as the Unitens 3 sensor - a Universal Calibration fixture is available which can be used with both Unitens 3 and Unitens 4 sensors.