The basic buret is used to hold alkaline solution. Its lower end is connected with a rubber tube. Glass beads are placed in the rubber tube to control the flow of solution. A pointed glass tube is connected to the lower end of the rubber tube. Any solution that can react with the rubber tube, such as potassium permanganate, iodine and other solutions, cannot be put into the basic buret.

The volume of buret is not completely consistent with its marked volume, so it must be calibrated in analytical work requiring high accuracy. Because glass has the characteristics of thermal expansion and cold contraction, the volume of buret is different at different temperatures. During calibration, a common temperature value must be specified, which is the standard temperature. The international standard temperature of glass containers is 20 ℃, that is, the volume of glass containers is calibrated to the actual volume at 20 ℃ during calibration.

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