Now, this is one thing that is cheap, yet feels like quality, through and through. As has been said in almost all reviews, this unit is extremely sturdy. Kept in its box, I cannot see why it shouldn't last a life-time.
I bought mine since I am making my own mic cables and want to check them before using. And I caught a faulty one on the first cable I soldered. Easily fixed, though...
This doesn't come with a battery, but it does have pretty much everything else from the get-go.
I couldn't be happier with it. It even seems to be next to identical to much more expensive testers sold under different brand names.