Rulers used for grammar exercises in Montessori pedagogy.
 Length: 20 cm
 PEFC certified poplar plywood, 3 mm thick.
 Can be painted, varnished.

 First ruler: Parts of speech 3-6 years (noun, article, adjective, conjunction, preposition, verb and adverb).

 Second ruler: Parts of speech 6-12 years (noun, pronoun, article, adjective, conjunction, preposition, verb, adverb, interjection).

 Third ruler: Sentence analysis (verb, adverb, arrows, noun, direct object, indirect object).