This is a great looking display, on a nice looking shield specifically designed for Arduino MKR.
Unfortunately, the required SSD1311 library (at https://github.com/n2j7/SSD1311) is very, very limited, and as of now, quite a few functions that the display driver chip itself supports (such as double hight operation) are still on the 'to do' list of the developers of the library... The library documentation is also poor.
Also, unlike many other display libraries, it is difficult to print several elements on the screen in sequence (one needs to provide the exact cursor location for each item so the length of all items should be known and fixed), and also, variables cannot be easily be used to print on the display.
Concerning the last item: after a bit of research, I found the following way to converts float to the "const char *String" that is used by this display library.
Works very well. I find the biggest problem is getting my probes to make a consistent connection to get repeatable readings, but that's a probe problem, not the adapter. There was one component that is soldered on at a 40 degree angle - Looks like a 3 point smd (sot-3?) on the board, but has a 5 leg component. Looks goofy, but it seems to work.
Overall, it works well, but it is limited... A missing touch (which would make it more expensive) would be to have an on board calibration. My probes measure 190mOhm so any reading I take, I have to subtract that. Easy math, but would be nice to 'zero it' on the adapter -- after all; this is marketed to cheap DMM users, which usually lack a 'zero' button. (I recognize the price point it probably doesn't make sense for this feature) But that leaves me limited. Anything over 10 milli ohms , I have to go from 200mv range to 2v range, losing some precision. Also, 1ohm -YourProbeResistance = max resistance you can measure. (Range appears to be 0 to 1 ohm). I tried to find the lowest reading I could get - and using some (unmelted) solder (I forget the percentage/makeup) I got 3.2miliohms, with the other solders/wires and direct adapter-end to adapter-end was between 10mili ohm to 30mili ohm. Your probes, solder joints, etc will really play a roll in the range you are ultimately able to read. The adapter is much more sturdy/stout/strong than I expected. You must remember to turn it off -- the battery life is short if you forget. Pre-sale communication was great; post sale questions have gone unanswered...
if you are digging around your board/project looking for that small needle in the haystack problem, this could help. Be sure your probe tips are sharp so you get a good consistent reading.
I will recommend it to friends....