Bring Tove calipers and tongs when found. The mission will be completed if the Hero hands over a total of 100 (or more) tongs and/or calipers.
The easiest way to get calipers/tongs is to go to the Imperial City, in the Waterfront and Market District, as the crates and barrels there contain a lot of calipers, which respawn. Additionally, the trolls found in Tidewater Cave carry up to seven calipers each.
Tove the Unrestful is looking for calipers and tongs. He says he'll pay five gold each for them, I don't remember agreeing to help him, but somehow I am.
Tove seems to have run out of uses for calipers and tongs. However, I earned a tidy little sum off of him in the mean time.