Designed specifically for aquarium use to measure the salinity of natural sea water (NSW). Most handheld saltwater refractometers available in the hobby are designed and calibrated for testing brine solution, i.e. sodium chlorid...
Marine Depot Single Media Reactor for GFO or Carbon
Finally, an easy-to-use media reactor that is both economical and durable!
Great for use with GFO (granular ferrous oxide), activated carbon, biological media or most typ...