poo-ometer ?

here is a device on the wall in the men’s toilets near the business lounge at Tegel Airport. it’s obviously measuring something, but what ?
DSC08280.jpg
(click for big version)
Travelling is an education. whilst waiting for the plane i learnt how to grow very long parsnips (use a drain pipe) and whilst flying I learnt how to transport pets to australia (use a specialist company – allow for around £1000 per pet including flights (via Bangkok) and quaranteen).

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