Prior to the use of several standard concentrations to find the conversion equation or conversion curve, measuring liquid Baume degree, the conversion table and the like. (1) First estimate the measured liquid Baume value possible range should be re-washed density Meter, are determined by the proportion of the method, according to the measured proportion, according to the accuracy required to select the Bomei; (2) Baume and carefully into the United States, and then into the Baume; (4) Baume immersed in the liquid , And continue to stir, so that no bubbles in the liquid, if the meniscus is not normal, the highest hand holding the pipe engraved above the vertical position; (3) the container to be cleaned and then slowly poured into the test liquid Femtosecond detection found only the proportion (density), according to the measured proportion, conversion concentration, easy to read. Baume degrees of different solutions are similar; (5) Bomei must not touch the walls, bottom and agitator of the vessel at the time of reading. The readings shall be based on the engraved lines on the lower part of the meniscus. Baume degrees larger