Now I need to know how to use a checker

Your current setup works. Just make the checker check for more than 0 of the item.

it did not work for the button

Did you put if the check passes, activate button? Is the button deactivated on game start?

for transmit on channel, using the vending machine is not worth it considering that button and checker is only 85, when a vending machine is 125, even if you want to make it “deactivate on purchase” it is only 110 memory, so except if you have other settings like “scope” you should aways use button and checker

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You don’t need to post about your topic, people will find it. It’s not the biggest thing, but keep it in mind.