They said that after 17 years of observation "the Tower of Pisa is stable and very slowly reducing its lean".
It inclines away from the perpendicular by about half a degree less compared to the turn of the century, according to the monitoring team.
Already during the construction, the tower sank into the sandy ground, so that from the fourth floor onwards, it had to be built diagonally in order to compensate the inclination.
In 1990, the tourist favourite was closed to the public for the first time in 800 years amid fears it could be on the verge of toppling.
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Many other measures to prevent the tower from collapsing, however, worsened the inclination. It reopened 11 years later, after various methods to counteract the tilt managed to reduce it by 15.95 inches.
It means the building in Tuscany, which attracts thousands of tourists every day, is back to the tilt it had at the beginning of the 19th century, according to professor Salvatore Settis, who leads the surveillance group of the monument.
Officials in Pisa have also halved the number of visitors allowed to clamber to the top of the tower for a sweeping view of the Tuscan surroundings. Only about 400,000 visitors climb the tower each year, while almost 3 million visit the site, which includes the cathedral, baptistery, two museums and a cemetery.
The works were successful and had corrected the lean on the tower by 45cm when the works were finished in 2001 at a cost of over €200 million.
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