Klaus
Only just saw this thread, we get the same request very often, get in touch with Goering Kerr Scotland, Lock Industries or Eriez Magnetics for textile needle detectors, the type of detector you need is quite specific, most 'normal' detectors will pick up some but not all of the textile needles due to different types of steel being used within the industry, stainless needles are impossible to detect as are hypodermic.
Hope this saves you some time & money.
Nigel, thank you. I didn't consider an industrial metal detector because of its price, size and lack of versatility. As to small, hand detectors such as falcon md20, and ProGrade, I saw some presentation, read specifications, and they did not seem very encouraging (noisy, short distance). They did not seem to perform any better than would a regular metal detector do, and a regular detector could be of some other use to me.
But I admit, I have not contacted the manufacturers for advice - I just relied on the information I could find myself. I will write them an email, and see. Maybe they could fine me something reliable, but not extremely expensive. Still, I'd rather buy a regular metal detector.
And now I see, I own everyone an explanation. Sewing is more a hobby, than a regular job to me. I do it a home, several products a months. And I always try to be on the safe side. That is why I need a MD, but also why, industrial solutions seem not for me.