The display of ee on the sphygmomanometer means measurement failure. It is possible that the cuff is tied too loosely or too tightly, or the cuff has collapsed, or there may be a malfunction of the machine, insufficient power or leakage of air, and so on. Electronic sphygmomanometers are more commonly used nowadays, and they are easy to operate and the results are relatively accurate. If ee is displayed on the sphygmomanometer, it means that the measurement has failed, and further search for the cause should be made. The most common reason may still have something to do with the patient’s measurement irregularity, the common cuff binding is too loose or too tight, it is generally recommended that the cuff is appropriately loosened or tightened to fit into two fingers. There is also the part of the cuff paste, may be a long time paste is not firm, in the process of inflation cuff collapse, this situation will also lead to the display ee measurement failure. If you exclude the factor of inaccurate measurement, you should consider whether the machine is abnormal or insufficient power or air leakage and so on. Sphygmomanometers are also considered relatively sophisticated medical equipment, if you can not figure out, it is recommended to go to a professional to check and repair.