@penstruck The general rule of thumb is to take three separate measurements a few minutes apart. Almost universally each successive result will be a lower pair of figures showing BP. I would take the lowest of the three as the real value, but averaging them might be a better indicator of your 'daytime' BP. Notice that doctors and their nurses never do that? You get one cuff measurement and then comes the raised eyebrow.
We have three cuffs at home, one of them well worn and it seems to show the lowest scores routinely. The newest one, rechargeable and only a reader/display on a cuff, no tubes or wires, reads a bit higher than the other two. So, it could be that the newer cuffs will tend to show higher scores. Mebbe? But you have the luxury of being able to take three readings several minutes apart. The idea is to sit still, unlax, think about bed, a nap, a walk...nothing that might remind you of obligations or troubles...and then take three measurements. The lowest is probably what you have normally when not flustered, embarrassed, angry, walking, etc.