Unfortunately, it is currently not possible to find out the exact balance of cards in automatic checkers.
Automatic checkers have the functionality of checking the card for its validity and suitability for further use.
Most automatic checkers can kill a card and render it invalid, so you can only use them at your own risk.
You can find out the exact balance of the card by calling the hotline of the bank that issued the card (not all banks provide information on the exact balance, in some cases, in addition to the CC data, you need to know the Fullz data (Full info) of the cardholder - SSN, DOB, address, phone number, BG).