Here are two happiness scales (the Authentic Happiness Index and the Subjective Happiness Scale):
-------------------------------------------
Authentic Happiness Index (Previously known as the Steen Happiness Index, as used in the seminal positive psych research study:
Seligman, M. E., Steen, T. A., Park, N., & Peterson, C. (2005). Positive psychology progress: Emperical validation of interventions. American Psychologist, 60, 410-421.
---Available for free at:
www.authentichappiness.org
Also, see page 57 of Therapist's guide to positive psychological interventions for a brief description on the scale, available via google books at:
http://books.google.com/books?id=B_...wAw#v=onepage&q=Steen Happiness Index&f=false
--------------------------------------------------------------------------
Subjective Happiness Scale
See pages 17-18 of this book for the SHS. This one is also accessible for free in its entirety via google books:
http://books.google.com/books?id=7_...=onepage&q=subjective happiness scale&f=false