I thought these devices were similar to those used by rock climbers? I guess
one has to know when a device is certified to always perform as it should
and when its made to a price though.
I recall a Sony Luggable tape recorder which had kind of twist on clips for
support. It never did faile nbut it looked decidedly dodgy.

Brian

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Years ago when I bought the analyser I use now most of the time I was
a bit worried about the way the carrying strap was fixed to the case.
It had those things like you get on dog leads, that just clip onto the
collar. I put loose cable ties alongside these clips, just in case one
of them ever did accidentally unclip itself. Last week I was climbing
a scaffold ladder with the analyser on my back when I felt something
brush against it. At the top I had a look and sure enough the clip had
been unclipped and the only thing saving the analyser from a 50ft fall
was the cable tie.

Bill