The Corowell Guard app is the only way to check Corowell Passes for their current validity.
This is how it works:
1. Open the app
2. Scan the Corowell Pass
3. One of the following three messages is displayed:
a) "Pass ok"
b) "Pass expired"
c) "Pass invalid"
This is how it works:
1. Open the app
2. Scan the Corowell Pass
3. One of the following three messages is displayed:
a) "Pass ok"
b) "Pass expired"
c) "Pass invalid"
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