Sailboat Rigging Tension Gauge from Loos & Co., PT-2M Professional Metric Hands-Free Force Gauge for Tensioning and Tuning of Shrouds, Cable Rigs, Wire Rope Standing Rigging, and Forestays, for 5, 6, and 7 milimeter Cable Diameter Measures tension in cables to check for proper setup in sail rigging and supporting cables for large tents, radio towers, and other structures Analog gauge shows present tension in kilograms (kg) Measurement accuracy of + or - 5 percent Measures tension from approximately 5 to 25 percent of the cable's breaking strength Can remain hooked on the wire during testing while tension is adjusted