You get an instant "Hmmmm?" when you see a dial, it becomes instinctive.
A bit like inspecting the troops at morning fall-in or Both Watches and you spot the odd one out.
<in a calm fatherly voice>
"Did you shave this morning son?"
"Yes Sir!"
"Disposable razor was it?"
"Ummm.....Yes Sir!"
<now using Warrant Officer voice>
"Then use a new one and be back here in 10 minutes! CLEAN SHAVEN!"
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