Had a regular checkup at the supermarket for my life insurance provider and I was diagnosed with borderline high blood pressure 140/93. Spoke to the pharmacist and was referred to my GP. Now you can't make a GP appointment nowadays (they are all booked up plain insanity), you have to wait to see the same day team, so rather than sit in the waiting room for hours I thought I'd double check by getting one of these.
Easy to use. Open the box, insert the batteries (which are included, you don't get that often nowadays), plug the tube into the box, slip on the cuff (make sure it's the right way up), tighten (not too tight) and press the button. Hey presto in under 30 seconds you've got your Systolic/Diastolic readings and your pulse rate. It doesn't do anything else, but what else do you really need?
The top of the cuff is the widest (for above your bicep), fully open it's going to wrap around a 40cm arm and the narrowest bit (near your elbow) is about 34cm fully open.
Oh and I'm fine btw. The supermarket had the aircon up to max that day and I was chilly. It turns out that can affect readings but neither the pharmacist or the practitioner mentioned the fact. Blood pressure readings are obviously a little unreliable, get one of these and you can check whenever you like and keep your own diary!