Loos offers a series of gauges designed to measure the tension in rod rigging that is commonly seen on larger sailing yachts. The gauge can measure rods ranging from 0.172 in to 0.375 in in diameter over a range of approximately 5 to 25% of the breaking strength of the rod with an accuracy of + or - 5%. This series of Loos rod tensioning provides an increased durability, accuracy and convenience of use. Manufactured of rugged anodized aluminum, this gauge is corrosive resistant and will give years of service. Detailed operating instructions are included with each tension gauge. Operates in the same manner as the Professional Model Series, by allowing the cable to be adjusted while the gauge remains on the cable -- just watch the pointer move.