Cygnus Instruments Ltd is the leading manufacturer of multiple-echo ultrasonic thickness gauges used for testing metal thickness through protective coatings. Cygnus have now also incorporated echo-echo and single-echo measuring modes into their units for measuring extremely corroded metal and heavy pitting. The Cygnus range of thickness gauges includes: the Cygnus 2 Hands Free models, engineered for rope access applications; highly versatile Cygnus 4 models with a large LCD display with simple-to-use keypad and menu; the Cygnus 6+ model which includes advanced features, such as comprehensive data Logging model enabling easy logging; ATEX certified Intrinsically Safe gauge requiring no plant shutdown or hot work permit; the rugged Heavy Duty model; wrist-mountable underwater divers gauge with A-scan display for thickness measurement verification; the original hand-held Underwater thickness gauge designed for divers taking thickness measurements up to 300 meter depth; and a ROV mountable series with probe handling solutions. In addition to thickness gauges, Cygnus boasts an ultrasonic product, named Cygnus Hatch Sure, that tests weather tightness of hatch covers.