Hi Lukas,

In my testing this works as expected. Would you mind providing the original and 
new measurement IDs, and I will take a look?

As for the wording about subset, I think this could be clearer and I will look 
into changing the text a bit. But the reason it says set/subset is that over 
time the probes originally scheduled for a particular msm will degrade (some 
will be disconnected or abandoned), so you will usually not get all the probes 
that were scheduled originally, but rather a "subset" of them. Perhaps this 
could be the reason you did not get all the probes you expected in your new 
measurement?

Kind regards,

Stephen
Atlas UI

> On 16 Jul 2026, at 19:54, Lukas Tribus <[email protected]> wrote:
> 
> Hello,
> 
> 
> when I'm using the "Reuse from existing measurement" probe selection
> method, only a single probe (the last probe looks like) from the
> existing measurement is used, not as expected all the probes from the
> existing measurement. The low expected daily cost is a good indicator
> for this as well, a part from actually starting a measurement and
> confirming that it only contains a single probe.
> 
> I tried with a new and empty Google Chrome profile just to exclude any
> interaction with Firefox, browser caches, or the FF extensions I use,
> and the behavior is clearly reproducible.
> 
> The UI also suggest that using a *subset* of the probes selected in a
> previous measurement is possible, however I have not found a way to
> actually select probes. The arrow pointing down is not doing anything
> for me (just endlessly loading nothing).
> 
> This could absolutely be an embarrassing PBKAC issue, considering that
> I just spent an undisclosed amount of time the other day to diagnose
> why my anchor selection didn't work for the HTTP requests I was trying
> to run (of course it's not that you can only run HTTP requests from
> anchors, it's that you can only run HTTP requests *against* anchors as
> a target...).
> 
> 
> Thanks,
> 
> Lukas
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