Harmony Marine Service is a Zhoushan-based inspection contractor offering hull ultrasonic thickness gauging to commercial shipping calling at one of China's busiest ship repair and bunkering hubs. The firm holds service approvals from ABS, Korean Register and Lloyd's Register, allowing technicians to deliver attendances that feed directly into classification survey files. Work is concentrated on ultrasonic thickness measurement of shell plating, decks, internal stiffeners, tank boundaries and other critical members to verify residual scantlings against original construction values. Typical assignments support intermediate and renewal special surveys, condition assessment programmes for older tonnage, pre-purchase and pre-charter inspections, and damage surveys following heavy weather or contact incidents. Reports are prepared in formats accepted by attending class surveyors, with steel renewal locations clearly identified for shipyard planning. Operating from Zhoushan gives Harmony Marine quick access to the major repair yards, anchorages and bunker areas of the East China Sea, where vessels often combine gauging with other survey items during short repair stays. Ultrasonic equipment is maintained under documented calibration regimes, and operators are qualified to the standards expected by the approving societies for thickness measurement on marine structures. Procedures follow IACS guidance on close-up survey and thickness gauging for bulk carriers, tankers and other vessel types within the enhanced survey programme, helping owners and managers plan repairs with reliable structural data. Records of measurements and the calibration history of ultrasonic gauges are retained for traceability, and Harmony Marine releases reports in English where required for international clients. Working in Zhoushan also keeps the team within easy reach of vessels mid-voyage between Far East ports and the Yangtze, supporting owners using the area as a strategic location for opportunistic gauging campaigns.