Yes, READINGS is a Scrabble word!

Letter values in Scrabble US: R 1, E 1, A 1, D 2, I 1, N 1, G 2, S 1.

Is it a valid word?

READINGS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

the cognitive process of understanding a written linguistic message
a particular interpretation or performance
a datum about some physical state that is presented to a user by a meter or similar instrument
written material intended to be read
a mental representation of the meaning or significance of something
a city on the River Thames in Berkshire in southern England
a public instance of reciting or repeating (from memory) something prepared in advance
the act of measuring with meters or similar instruments

interpret something that is written or printed
have or contain a certain wording or form
look at, interpret, and say out loud something that is written or printed
obtain data from magnetic tapes
interpret the significance of, as of palms, tea leaves, intestines, the sky; also of human behavior
interpret something in a certain way; convey a particular meaning or impression
be a student of a certain subject
indicate a certain reading; of gauges and instruments
audition for a stage role by reading parts of a role
to hear and understand
make sense of a language

Also: meter reading, reading material.