A bit off topic
About three years ago, very shortly after the cabin restrictions were tightened I had to visit a number of properties in Germany for work. This also entailed measuring them. Being reasonably technical I use a laser tape measure that I thought might give me some issues. Nope it sailed through.
Also being a past boy scout, and not having time for anything to go wrong I carried a 100 ft manual tape. These come in a flat circular design, and could easily be described as remarkably similar in size and shape as Land Mines.
No issues at Manchester or Frankfurt. But at Dusseldorf had two very confused security personnel. Because of where I was stood, I could see it going backwards and forwards while they hummed and erred. Their English was poor, but it was easy to see where the problem was and we all had a good laugh when they saw what it was.