Question about Voltcraft SEM6000 CH

I have had 2 of them for about 1 year and both work without any problems. I have installed the iOS version of the app and in 99% of cases the devices connect to the app after a few seconds. If it doesn't work, it helps to disconnect the device briefly (for about 3-4 seconds) from the mains.

Oh yes... and of course the location service must be activated, otherwise nothing works.

The connection setup with PIN request can be ignored (is not necessary and only confuses). Connectivity is also very sluggish for me (apparently the more devices you connect, the worse). But with a little patience, I always find them all (on Android 9). Sometimes pressing the "Search devices" function several times seems to help, sometimes not. Individual measuring devices are sometimes only recognised as active after about 2-3 minutes in the list. In principle, it works for me, but it could be much better.