OP, the adjustable stem is a very useful technique for dialing in your stem/bar fit. Just keep a few things in mind:

Although angle may be marked on the stem, it isn't necessarily important, because MOST LIKELY on a road bike you will replace the adjustable stem with a fixed one that only has +/- 6 or 7 degrees depending upon the maker. So angle is just a way to adjust length and height. You are not likely going to buy a fixed stem with the same angle as the adjustable stem (dorky). When you have the adjustable stem where you want it, you have to take measurements of the bar height and reach that the stem is giving you and you like. Combining those with the angle if you can read it, then you have to convert those dimensions into a spacer stack, stem length, and stem flip position (and angle, yes, but probably chosen from the limited road offerings) that replicate the adjustable stem position. Might involve some trigonometry (ouch!), and it sounds harder than it is. Some of us here can help you with that if needed.