Feature: 1. Standardized Scale: The device adopts standardized scale, which is accurate and easy to read. The digital display is quick and easy to read. 2. Portable: The digital refractometer is based on a microprocessor, with laboratory accuracy, can accurately and instantly measure parameters such as refractive index (RI), concentration and other parameters of various liquids, and has a friendly operation mode and display area and an automatic temperature compensation system, Measurements are faster, more accurate and clearer than traditional handhelds. 3. Digital Screen: Equipped with suction tube and spare protective cover. The function keys are clear and easy to operate. Digital screen with large numbers to display battery level. 4. Temperature Unit Conversion: Press the "SCALE" key for more than 2 seconds, the meter will display Celsius or Fahrenheit. 5. Calibration: No need to calibrate every time. Drop 2-5 drops of distilled water on the sample plate, confirm that the temperature of the water and the instrument are the same, the standard temperature is 20℃, and then cover it. Press the "CAL" key for more than 2 seconds until the "CAL" flashes, then press the "CAL" key again, the meter displays "END" and displays 0.0%. Specification: Item Type: Digital Refractometer Material: ABS Product Size: Approx.12.5 x 6 x 3cm / 4.9 x 2.4 x 1.2in Battery: AAA x 1 (Battery Not Included) Uses: Used To Measure Honey Sugar Concentration, Coffee Concentration, Beer Sugar Content, Etc. Weight: Approx.328g / 11.6oz Brix: Range: 0.0% to 50.0%, Accuracy: ±0.2%, Resolution: 0.10% Range: 0.0% to 90.0%, Accuracy: ±0.2%, Resolution: 0.10% R.I.: Range: 1.3330 to1.4200, Accuracy: ±0.0003, Resolution: 0.0001 Range: 1.3330 to 1.5177, Accuracy: ±0.0003, Resolution: 0.0001 Temperature: Range: 0.0 to 40.0℃, Accuracy: ±0.5℃, Resolution: 0.1℃ Range: 32.0 to 104.0℉, Accuracy: ±0.9℉, Resolution: 0.1℉. Package List: 1 x Digital Refractometer1 x Dropper1 x Protective Cover1 x User Manual1 x Storage Box Note: 1. After measuring a sample, rinse the sample plate with distilled water and dry with a soft cloth or paper towel.2. Do not leave sample residues in the sample plate for extended periods of time.3. After measuring the corrosive liquid, please clean the sample plate as soon as possible to avoid irreparable damage to the prism and the metal surface of the sample plate. 4. Please wipe the sample plate with a soft cleaning cloth or paper towel to avoid scratching the glass of the prism.5. When not using a dropper and a dust free cloth, please wash it with clean water, dry it and put it in the box.6. If the instrument will not be used for a long time, please remove the battery and store it in a cool and dry environment.