Oky, in this video, it is described how to check your blood pressure just in 60 seconds without any devices. Follow these steps:
[ol]
[li]place your right arm with a wall[/li][li]try to put some pressure on your arm (on forearm and palm, as shown in video) for a minute[/li][li]after a minute, raise you arm upwards and[/li][/ol]
[LIST=|INDENT=2]
[li]if it goes up higher than shoulder, then your blood pressure is low[/li][li]if it straight in equal to shoulder, then your blood pressure is normal[/li][li]If it down to shoulder, then your blood pressure is higher.[/li][/LIST]
while pressing your arm and palm with wall, you’ll feel something on your shoulder, arm and palm, like stretch or very little pain but it won’t last.
If you move your left arm above your shoulder, you’ll feel stretch at you shoulder. In case of low blood pressure you won’t feel any stretch and your arm goes up easy.
If you have a minute, try this and then share what was your result 
P.S. I think today my blood pressure is low 