Reading time: 6 segments. 

There are 5 varieties of this scroll:

01-15 Protection from Air Elementals (including aerial servants, djinn, invisible stalkers, and wind walkers)

16-30 Protection from Earth Elementals (including xorn)

31-45 Protection from Fire Elementals (including efreet and salamanders)

46-60 Protection from Water Elementals (including tritons and water weirds)

61-00 Protection from All Elementals

The magic protects the reader and all within 10 ft. of him or her from the kind of elemental noted, as well as elemental creatures of the same, or all, planes. 

The circle of protection affects a maximum of 24 hit dice of elemental creatures if the scroll is of a specific elemental type, 16 hit dice if it is against all sorts of elementals. 

The spell lasts for 5-40 (5d8) rounds. 

Attack out of the circle is possible, as is attack into it by any elemental creature with more hit dice than are protected against or by several elemental creatures—those in excess of the protected number of hit dice being able to enter and attack.