GHL (GHL Advanced Technology) is a manufacturer of high-end aquarium automation and control systems, primarily focused on marine and reef aquariums. The company develops advanced equipment such as aquarium controllers (e.g., the ProfiLux series), dosing pumps, lighting systems, monitoring probes, and cloud-based management software. GHL is known for its engineering precision, reliability, and strong emphasis on automation and system integration for professional and advanced hobbyist aquarists.