The Hanna HI70024P is a premium quality, 35 ppt salinity calibration solution designed to ensure the accuracy of your digital refractometer or salinity tester. This professional-grade standard is essential for any saltwater aquarist who needs to verify the precision of their testing equipment, providing a reliable reference point to maintain the stable and specific salinity levels required for a thriving reef ecosystem. Regular calibration with a trusted solution is the key to consistent and dependable water parameter monitoring.

Each box contains 25 individual, single-use sachets, with each sachet holding 20 mL of solution. This convenient, single-use format prevents contamination and guarantees that a fresh, uncompromised standard is used for every calibration. The solution is manufactured to be precisely 35 ppt (parts per thousand), which corresponds to the ideal salinity target for most marine and reef aquariums. The sachets are made from a light-blocking foil, ensuring the solution's integrity and long shelf life until it is ready to be used.

This product is indispensable for meticulous reef hobbyists and professionals who rely on the accuracy of their digital testing equipment to make critical decisions about their aquarium's health. It is ideal for anyone using the Hanna Salinity Tester or other digital refractometers that require calibration to a known standard. By incorporating this simple step into their maintenance routine, aquarists can eliminate doubt in their salinity readings and confidently manage one of the most vital parameters for sensitive corals and fish.