Overall, a very nice gimmick, but unfortunately has only flea market quality for me !!!
So recommended only conditionally, unless you just want to guess "about" the state of charge of its battery.
Addendum: I bought today at my local Aldi store a digital battery tester incl 2 alkaline batteries for 3.99 !!!.
I attach great importance to easy handling and an absolutely precise display, the reviewed product is here for me a reason to discard it Unweltschonend, especially since I found at ALDI a much better sequel!
My conclusion: digital is more accurate and simpler than analog ;-)
So there I unfortunately only a limited absolute buy recommendation ...