The Ajax CMS mechanical flowmeter has been used to monitor cooling water on UK Royal Navy platforms from the early 1990s to today. That is a proper endorsement for reliability at sea.

Offshore oil and gas has the same demands: salt water, vibration and limited maintenance access. A mechanical flowmeter gives a direct reading without relying on power or electronics, which makes it a sensible choice for cooling water monitoring on platforms, FPSOs and support vessels. Made by F. Bamford in Stockport.