Minister Chee added that other global cities like London and Hong Kong also do not display fare deductions and card balances at fare gates, as they use ABT cards.
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Other useful Octopus tips
Checking the balance
Every time you use your card, the display next to the card reader will show the amount deducted for that transaction as a negative figure together with the remaining balance. If you miss this though, there are dedicated balance checkers in all MTR stations or you can check on the Octopus app.