Safe Material: Made of high quality plastic, transparent and readable saltwater hydrometer. Accurate, durable and easy to read the salt level and specific gravity of your marine aquarium. Small and waterproof. Clearly marked safe area: includes solinity and specific gravity scales. The outer range of the scale indicates salinity (PPT). The inner range of the scale indicates gravity. Suitable for brine and marine aquariums. Perfect for testing both salinity and specific gravity in your brine and marine aquarium. Easy to read and use: Easy-to-read swing arm pointer and extra large stable base provide a precise test.
