The Fritz 35ppt Calibration Fluid is a pre-measured solution designed to simplify the calibration process of refractometers used in measuring salinity levels in aquarium settings. Regular calibration ensures accurate readings, which are essential for maintaining optimal conditions for marine life.Key Features:Accurate Calibration: Provides a straightforward method to calibrate refractometers to a standard salinity of 35 ppt (parts per thousand) or a specific gravity of 1.0264, corresponding to natural seawater conditions.User-Friendly Application: Requires only 2 to 3 drops to calibrate your instrument, making the process quick and hassle-free.Compatible Ingredients: Formulated with sodium chloride and reverse osmosis deionized (RODI) water, ensuring purity and reliability.Calibration Instructions:Preparation: Shake the bottle well before use. Ensure the refractometer’s prism surface is clean; if necessary, wipe it with distilled or RODI water and dry with a soft cloth.Application: Place 2 to 3 drops of the calibration fluid onto the refractometer’s prism surface and cover it with the provided lid.Adjustment: While looking through the eyepiece, adjust the calibration screw until the scale reads 35 ppt or 1.0264 specific gravity.Completion: After calibration, clean and dry the prism surface. It’s recommended to check instrument calibration monthly.