Why can’t my aneroid sphygmomanometer be inflated after it has been pumped?
The most common cause is that the air-releasing valve (ARV) is not closed yet. Please make sure that the ARV is fully closed before use. You can simply turn the ARV’s knob clockwise.

How do I know that my aneroid sphygmomanometer is accurate?
For accurate measurement, the gauge needle doesn’t need to rest at the zero point, but please make sure that the gauge needle rests within the area of zero square prior to use. The zero square itself reflects the warranty for accuracy, i.e., ± 3 mmHg.

How long will my sphygmomanometer unit be durable for?
For a mercurial sphygmomanometer, there is no exact period of durability. The mercury will somehow evaporate over time and lose its volume. It can be replaced to keep the allowed volume for proper measurement preserved. Do not perform this procedure on your own; please contact a professional to refill the mercury.
For an aneroid sphygmomanometer, the unit is durable for up to 10,000 times of usage. The movement parts inside the gauge will slowly wear out over time. The unit might still be working after it reaches 10,000 times of usage, but there is no warranty that the reading still remains accurate. Please replace your aneroid sphygmomanometer unit with a new one for proper measurement.

Is it necessary to use a cuff of the proper size?
Yes. The wrong cuff size will lead to inaccurate blood pressure measurement since the initial pressure given for the measurement may vary depending on how large the arm circumference is. Please choose the right cuff size by making sure that the white index line is in the range between the arrows after the cuff has been put on.

Should my sphygmomanometer unit be calibrated periodically?
Yes, indeed. Please have your sphygmomanometer calibrated regularly, at least once a year. Contact a qualified professional to perform the calibration.