Harbaugh specifically cited Jackson's accuracy as a big positive after seeing the 2016 Heisman Trophy winner throw.
"The thing I was really impressed with is I thought he was accurate," Harbaugh said, via ESPN's Jamison Hensley. "You read the reports ... but he's a naturally talented thrower. He has natural arm talent. That's something that I think people were questioning. To see him out here throwing the ball naturally and very accurately, I thought it was a big plus."
Jackson improved his accuracy in each of the past two seasons at Louisville. He went from a 56.2 completion percentage in 2016 to 60.4 in 2017.
Despite the better passing numbers, Jackson only ranked 62nd in completion percentage out of 126 qualified FBS quarterbacks last season.
B/R's Matt Miller noted in his scouting report after the Ravens drafted Jackson with the 32nd overall pick that he will have to "rework his setup and better drive the ball with his legs to improve his accuracy—especially on out routes" because he "hasn't shown on tape that he can fit the ball consistently into tight windows up the seam."
Joe Flacco will likely enter the 2018 season as Baltimore's quarterback, so the Ravens have the benefit of giving Jackson time to develop his skills before testing him against NFL defenses.