About 2 Trademarks found that are owned by Matthias Gross

Measurement probes, namely, probes featuring sensors to measure alkalinity in water; measurement devices and instruments, namely, scientific instrumentation for measuring alkalinity in water; detectors, namely, alkalinity detectors; computer software for data recording of alkalinity in water

Electronic control systems for aquariums for monitoring and controlling water levels, water conductivity, water pH, oxygen reduction potential, salinity, and temperature, controlling of dimmable and non-dimmable lamps and for simulating natural environmental conditions that promote the health and growth of marine life; illumination regulators for aquariums