* This refractometer is design according to the principle that different concentrations liquid have different refractive index ，with quick and accurate characteristics.* Automatic temperate compensation， the temperature of the water sample will not effect the reading.* Aluminum construction heavy-duty and Light weight， small volume， convenient to carry.* Soft silicone handle provides good touching feeling.* High definition eyepiece give your a broader view and make your can read more accurately.* Complete with a soft sponge protective carrying case， a pipette and a mini-screwdriver for easy calibration.* Widely used in mariculture， aquarium， saline solution preparation， etc.Specifications:Measuring Range : w/w 0-10%Minimum Divisions : w/w 1‰Accuracy : ±1‰Length : 18CMWeight:109GHeavy duty (Durable Aluminum)Package Included:1 x Test Salinity Refractometer1 x Pipette1 x Wipe Cloth1 x Mini Screwdriver1 x Protective Carrying Case1 x Operations Manual