Card reader users sometimes input a combination of button presses including the green button first. Scam?

Question

Ocaisionally I have noticed that rather than being handed the card reader to input my pin and then press the green button I have noticed that the user will input one or two button presses and then green. This diconcerts me and i feel that it may be a card scam .

Answer 1

some units need to do a lot of prework before the pin is entered, but they should allow you to see the amount on-screen before you enter your pin.