The ornamental design for a sphygmometer, as shown and described.
1. Sphygmometer
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Left
1.5 : Right
1.6 : Top
1.7 : Bottom
1.8 : Other sight of perspective
The design is related to the pulse measuring instrument which can measure the pulse of the human body; it can be worn on the finger and it can be carried and the measured pulse data can be accumulated for a certain period of time; this design measures the pulse signal delivered from your finger after it is worn on your finger, so you can check the measurement result or send it to an external device; this design is powered by a battery inside the sphygmometer, so it can operate without any external power source.