capable of being understood by careful study or investigation.
Origin of scrutable
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
rare open to or able to be understood by scrutiny
Word Origin for scrutable
C17: from Latin scrūtārī to inspect closely; see scrutiny
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
c.1600, probably a back-formation from inscrutable.
Online Etymology Dictionary, © 2010 Douglas Harper