SENBONO D13 1.3'' Full-round Touch Screen Heart Rate Blood Pressure Oxygen Monitor 30 Days Standby I worth to buy? Thanks for it if those of you who have purchased SENBONO D13 1.3'' Full-round Touch Screen Heart Rate Blood Pressure Oxygen Monitor 30 Days Standby I could share about what you think of the product. I would love any extra info, as it is quite pricey as $63.99 and I just want to know it is good before paying for it.