The
5 Criteria for Evaluation of Right Concentration:

After emerging from the
deepest states so far attained one reviews it thus:
1: This absorption is Happy now, and results in future happiness
too...
2: This absorption is Noble, and unrivaled by anything in this
world...
3: This absorption is not reached by inferior, or unworthy
persons...
4: This absorption is entered upon & emerged from while fully
aware...
5: This absorption is perfectly Calm, Stilled, Unified, and neither
fabricated, nor suppressible, nor reversible, nor deniable...

Meditation Manuals here:
http://What-Buddha-Said.net/library/pdfs/anapanasati.pdf
http://What-Buddha-Said.net/library/pdfs/Main_Meditation_Manual.pdf
Source: The Exhaustive
Speeches by the Buddha. Digha Nikāya 34
http://www.pariyatti.com/book.cgi?prod_id=25103
http://www.accesstoinsight.org/canon/digha/index.html

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Bhikkhu Samahita