A simple wooden desk supports a book filled with ever-changing mystical entries.
Wondrous Item 5,000 gp
After remaining stationary for at least 24 hours, the ledger displays a detailed entry of each object within 10 squares and the best estimate of its monetary values.
Power (Standard Action)
You consult the ledger and learn the summed monetary value of all objects accounted for by the ledger's property. You instantly know if the total has changed in any way since the last time you consulted the ledger, but not when or by what means.
Published in Dragon Magazine 383, page(s) 45.