The Hikari Accuprobe Hydrometer is an essential tool for any saltwater reef aquarium owner, designed to provide accurate and consistent measurements of specific gravity and salinity. Maintaining stable and correct salinity levels is paramount for the health and vitality of corals, invertebrates, and fish in a reef environment, making this device a cornerstone of proper tank husbandry. It simplifies the critical task of monitoring your aquarium's water parameters. This innovative hydrometer features a "Dry Hands" design, preventing contamination of your aquarium water or sample, and takes a more "True" water sample at a 6-inch depth, avoiding inaccurate surface readings. It boasts an impressive accuracy of +/- 0.001 specific gravity units across a wide range of specific gravity and salinity (PPT) measurements. An auto-temperature correcting design ensures precise readings in warm water aquariums ranging from 68 F to 85 F, and its durable construction promises extended life and reliability. Ideal for both novice and experienced reef keepers, the Hikari Accuprobe Hydrometer is perfect for anyone seeking a reliable, easy-to-use, and highly accurate method for monitoring their aquarium's salinity. Its self-leveling hanging device and automatic sample collection at the perfect size make it incredibly convenient, allowing readings to be taken either inside the aquarium or on a level surface. This hydrometer helps ensure your reef inhabitants thrive by providing consistently precise water parameter data.