Ⅰ. Structure Drawing:
Ⅱ. Operation Steps:
A. Original Point Setting（Please do not forget this step）
1. Completely clear prism window .
Drop standard solution to fill
the prism window.
(The standard solution of DR28-65 and DRB28-65nD is 30% Brix solution or the solution with nD1.3812; The standard solution of DR58-92 and DRB58-92nD is 60% Brix solution or the solution with nD1.4419. The solution of other Model is distilled water.)
2. Hold “CAL” button for five seconds
till it twinkles “rEF” on LCD. Within 10 second after display “rEF”, press Mes button and hold it for five seconds. The instrument start to set Original Point. After Original Point Setting is finished, “End” will be displayed on LCD.
B. Measurement
1. Completely clear prism window. Drop solution to fill the prism window
2. Press Mes button
 
C. Conversion of Status of Scales
1. Turn it off.
2. Repeat step 1-2 to set other scale.(The chose status of scale will be stored no matter if power off.)
3. Synchronously hold “CAL” button and Mes button. Turn it on by pressing On/Off button.
Ⅲ. Other Operation
1. Installation Battery
In the case of no battery or low battery whit alert of “ “ on the upper left of LCD, you should install or replace the battery. Open the battery cover on the back of the instrument, install a battery or replace the old battery with a new one.
2. Power On and Off
Press the “On/Off” button to turn it on or off. Temperature in Centigrade will display when power on. The instrument will turn off automatically if there is no any operation in three minutes.
3. Measurement of Temperature
Temperature can be displayed at any time by press the button during measurement. The conversion of Fahrenheit and Centigrade can be made by pressing Temp button.
Ⅳ. Precautions
1. Don’t expose the instrument to low, high temperature and sun light for long time, to avoid LCD losing effectiveness.
2. Because the instrument is very precise, it prohibited from violent shock.
3. To avoid damage, don’t disassemble and assemble the instrument or change the inner circuit and parts.
4. Zero-setting should be implemented strictly according to instrument.
5. Be sure to clean the prism surface and window of stage before and after every measurement.
6. To avoid that accuracy is affected by evaporation, be sure to implement measurement immediately after dripping solution on window of stage.
7. It can cause worry result if keep measuring under low voltage.
8. Don’t use it under the strong light (as sunlight, lamp etc.)
9. Don’t use the instrument in the humid and corrosive environment.
10. Prevent from liquid into battery house.
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