Oops, I’ve always x-rayed my meter, it never occured to me not to! With my pump, most of the time they just look a bit bewildered, sometimes they swab it for explosives but mostly they just let me through without any problem.
I nearly ended up strip searched as a teenager in Frankfurt airport, having tucked a pack of fruit pastilles in my knicker elastic for a bike ride that morning as I had no pockets, forgot all about them, only to have them discovered whilst being frisked. I think in they end they just thought I was mad and let me go!