Fritz 35pptCalibration fluid

Fritz 35ppt Calibration Fluid delivers a pre-measured solution for accurate refractometer calibration without guesswork or specialised equipment. Essential for saltwater aquarists, this fluid ensures your instrument maintains precision for reliable salinity readings. Simply apply 2–3 drops to a clean prism, adjust to 35 ppt (1.0264 SG / 1.3394 RI), and recalibrate monthly to keep your refractometer performing at its best. Made from sodium chloride and RODI water for consistent, dependable results every time.