Salinity Refractometer Meter Water Reader Marine 0 - 10% Salt Aquarium TesterDescription:Measuring Range: w/w 0-10%Minimum Divisions: w/w 1 ‰Accuracy: ± 1 ‰Length: 18CMHeavy duty ( aluminum) Ideal for garage workshops, metal workers, builders, car mechanics, spray painters and DIY Professionally manufactured and designed to effectively blow air, clean parts and surfaces Made of metal comes with 10cm spare nozzleDimensions: 145mm x 85mm x 12mm (L x W x H) (Approx.) This refractometer is designed according to the principle that different concentrations of liquid have different refractive index, with fast and accurate characteristics. Automatic compensation moderate, the temperature of the water sample will not affect the reading. Package Included:1 x Test Salinity Refractometer1 x Pipettes1 x Wiping Cloth1 x Mini Screwdriver1 x Protective Case1 x User Manual