Make sure that you cover the keypad with your hand when keying in the numbers. Also cover as much of the front of the machines as you can with your body.
I was in a shop that sold telescopes etc and to demonstrate a spotting scope you could look nearly 300 metres down the street. At the end of this street there was an ATM. At 30+ Mag (which you could get on a good day) I could see the numbers being keyed in on the machine if the user did not stand in the way!
Baz
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