The terminals on the battery look correct, the QR code looks too dark, but it does that in photos alot, the seam is hard to judge based on the reflection in the photo.
The QR code should be subdued not crisp and dark, the seam should be straight not wavy. Don't sweat the white labels on them, I've seen several vape shops that print those out and put them on the
batteries, it makes it easy to see for customers, the printing on the battery wrapper is not easily visible from a distance.
Even if it is a fake it SHOULD have at least a 10a rating, so a 0.8+ build should not be an issue, if it's authentic have at it, I don't however recommend building below 0.2 ever.
As for the multi meter, it is not necessary to
buy a $200+ true RMS meter, but you should
buy the best one you can afford.
This is your parachute, would you jump with one you bought on ebay for $50?