Activity in the U.S. manufacturing sector rose less than initially estimated in August

WASHINGTON (MarketWatch)
Activity in the U.S. manufacturing sector rose less than initially estimated in August, the Markit purchasing managers' index, or PMI, for the sector showed Tuesday
The final PMI came in at 51.5, up only slightly from 51.4 in July, but below an earlier "flash" estimate of 51.9
Readings above 50 indicate expansion, and the PMI signals only modest improvement in conditions, Markit said
The Institute for Supply Management's manufacturing index, due at 10 a.m., is expected to show a reading of 50.2%