Hello once again!
I have made a fairly simple New Scratcher tester.
It works as described below.
It has two variables, cloud (local) and ☁ cloud.
It starts by changing cloud to ☁ cloud, and then changes ☁ cloud by one. (as you may know, New Scratchers cannot change cloud variables.)
Then it tests if cloud is not equal to ☁ cloud.
If they are different, it says you are a Scratcher.
If they are the same, it says you are a New Scratcher.
In Scratch code, this can be represented as:

when green flag clicked
set [cloud v] to (☁ cloud)
change [☁ cloud v] by (1)
if <not <(☁ cloud) = (cloud)>> then 
say [You are a Scratcher!]
 
else
say [You are a New Scratcher!]