From A Wiki of Ice and Fire
The King's Scales is a position in the royal court of the Seven Kingdoms. The position falls under the jurisdiction of the master of coin.
According to a semi-canon source, the King's Scales is the keeper of the royal weights and measures, and enforces the measurement standards throughout Westeros. Spice, wine, and wool factors are employed by the King's Scales, and play a more direct role in assessing tariffs and duties.
A Clash of Kings
Tyrion Lannister notes that several key offices of the royal bureaucracy are filled by Petyr Baelish's men, among them the King's Scales.
- ↑ 1.0 1.1 A Clash of Kings, Chapter 17, Tyrion IV.
- ↑ 2.0 2.1 Blood of Dragons: The Court in King's Landing