PSA: if you are using methamphetamine, do not rely on anything but a hospital grade or hospital-calibrated DIGITAL blood pressure monitor. There's no way anyone on meth should be trusting their time perception and multiplication/basic math abilities for something as serious as monitoring one's systolic/diastolic/bpm (Which EVERY serious/regular/HR-prioritizing meth user should be monitoring and documenting, before, during, and after dosing, redosing, etc...) When I would use methamphetamine, I documented my blood pressure and heart rate and body temperature at least five times per 24 hours.