Tabletop mercury sphygmomanometer traditional mercury column (mercury column) type sphygmomanometer:

There are two kinds of desktop and vertical sphygmomanometers, and the vertical sphygmomanometer can be adjusted to any height. But the volume is slightly larger, inconvenient to carry, and carry the process is easy to make the mercury leakage and affect the accuracy, so each measurement must be checked before the scale tube mercury convex surface is exactly at the zero position of the scale, pressure measurement is completed after the sphygmomanometer tilted to the right side of the 45-degree switch will be turned off, so as to avoid mercury leakage.