AQUA ONE GLASS HYDROMETER Aqua One Hydrometer with Thermometer Glass provides an accurate reading of temperature and specific gravity. Green indicators show a safe range of saltwater level and temperature for most saltwater species. Directions for use: Place the hydrometer at the opposite end of the aquarium to the heater (if installed) If the green indicator is below the water level more fresh wateer is required Do not add unmixed synthetic salt to an aquarium containing live stock Consult your aqua one retailer for further information
