Oxford Bookworms (OUP)
Series aimed at students learning English as a foreign language. Appropriate level can be identified online by accessing sample pages below from the seven Bookworm Stages. Scheme advises that if a student finds more than two or three words they don't know, they should move down a level, and continue until they find a comfortable reading level. See http://www.oup-bookworms.com/find-your-reading-level.cfm
