You won't find any joy with that Smok, It doesn't display hundreths eg 0.23 it rounds off to the nearest tenth. Purchased one thought it had it all, voltage drop tester etc. Just collects dust.
I got this el cheapo one from vapeclub I believe when I started getting into rebuildables, works just fine.
Yip got one of those el cheapos and it works great... Bummer on the Smok not having penalty of decimals...