Ok Kelly, here's the verdict: I measured wpi and I got 15, which is just barely sport weight; however, the vendor I got it from classified the yarn as dk weight. And this makes me realize that I listed one of my items wrong! Thanks for inadvertently helping me catch that!
So would you like me to dye you up a hank of Midnight Haze with this sport/dk weight superwash merino? If so, I'll post a special order listing on Etsy.