Feature: 1. More accurate measurement, the resolution of the digital salt concentration meter is 0.01%. Specification: Condition: New Item Type: Digital Refractometer Material: Plastic Waterproof: IP65 Temperature Compensation: 10-50 Automatic Temperature Compensation Battery: 1 x 1.5V AAA Battery (Not Included) ModelFunctionMeasurement NumberMeasurement RangeResolutionAccuracyDR201SalinityS010.0-28.0%0.1%0.2%SalinityS020-28012Specific GravityS031.000-1.2170.0010.002Refractive IndexS041.3330-1.3900nD0.0001nD0.0003nD Package List: 1 x Digital Refractometer (Battery Not Included)1 x Instruction Manual1 x Suction Cup1 x Plastic Dropper Note: 1. Please clean and wash the sample plate with distilled water and dry it with soft cleaning cloth or paper towel after finishing the measuring.2. Never left the remains and residuals of samples in the sample plate for long time.3. After finishing measurement of the corrosive liquid, please clean the sample plate as quick as possible to avoid the irreparable damage of the prism and metal surface of the plate.4. Please use soft cleaning cloth or paper towel to clean the sample plate to avoid scratching the prism's glass.5. When the dropper and dust-free cloth are not used, please clean it with clean water and put it in the packing box after drying.6. If no using the instrument for a long time, please remove the battery, and preserved in a cool and dry environment.