I'm going to chime in here.
Physician Assistant, been measuring BPs forever with all kinds of equipment in all kinds of situations. Traditional arm cuff, wall or built in gauge, and stethoscope method: 3 potential problems, gauge needs to be re-calibrated occasionally, wrong size cuff (e.g., normal size used, extra large needed), but most common error is human, sloppy technique. The provider who pumps it up and gets a reading in 3 seconds rarely gets an accurate reading. However, to be fair, it may well be close.
A proper physical exam, manually and with the stethoscope, reveals a broader range and more specific cardiac and circulatory information, and of course, there are a myriad of other, more sophisticated tools readily available, if the exam indicates their use.
As for wrist cuffs, I have and regularly depend on an Omron model ($50-60 my cost, probably more retail) at home. Good unit, good brand, dependable and ACCURATE ( I test it against the arm cuff occasionally). Data and graphs can be downloaded to PC. Helpful.
I have reviewed data from many wrist BP cuffs over the years. my experience is that generally they work adequately well If they are positioned and operated as intended. Otherwise, but rarely, they don't work at all. I have never seen a "partial" failure - progressively odd or wildly swinging results.
I don't know this "Precision" brand. However, my first thought when looking at the models on offer today was that the faces are oriented exactly 90 degrees off for convenient self-use. The faces (top/bottom) should be parallel with the wrist band and perpendicular with the arm for easy reading of the screen, pushing the buttons, etc., like a wrist watch, not the opposite as these appear to be. I don't recall ever seeing a wrist BP cuff constructed this way.