noun
automatic fare adjustment machine
A machine found at train stations that calculates and processes fare differences, often used when exiting with an insufficient ticket or IC card balance.
改札を出る前に自動精算機で不足分を支払った。
Before exiting the ticket gate, I paid the shortfall at the automatic fare adjustment machine.
Compound of 自動 (automatic), 精算 (fare adjustment), and 機 (machine).