Hey!
That's not bad at all. Well, it is just $20 and not overpriced as an "Audiophile" labeled accessories.
Anyway, I've been using this hand tally counter to track the hours of my KR Audio 842VHD tubes for some years now. I also have another one to track the 845B tubes in my other SET amp.

But that digital counter would be more accurate for sure, I might get one

Buddy