Credibility and quality of product seems to me be less than I expected though it might be workable in its short life. I engraved on walnut wood grip surface of competition air-gun as pictures attached, and it is good though I feel it isn't solidity structure, might be broken after a couple time of appropriate usage.

These are a great little tool. This is the second one I've used and love the versatility. I haven't found any dremel bit that will carve into hard stone as well as the tips that come with this will.
I will recommend this for anyone that wants a low cost alternative to a dremel for engraving/etching and light carving.

When screwing the top on, it turns it on automatically without touching the switch. Once fully screwed together, it does not fibrate at all .

I work at a salon job where every tool we own has to be black, so a lot of us have the same tools. We have a similar handheld engraver pen at work, but I wanted to be able to use one at home. I used this engraver to be able to tell my tools apart from everyone else's. Even when I have fresh batteries in mine, it doesn't have much power. I dont know what brand the one from work is, but my boss said he paid like $10 on amazon and it looks very similar, so i thought i was getting the same one. It isnt the same quality, though. This particular engraver does eventually do it's job, but it feels like a lot more effort than the one we have at work. It constantly feels like it's sluggish, like the batteries are running low, even when I've just put them in. If I have a defective one, I'd love an opportunity for a replacement.

It's a great engraver, especially for the price. 2 AA batteries aren't included.