I like this item. After writing something out and waiting for a few seconds you cannot tell if something is there, there is also no press marks from the pen.

worked as advertised

I gave the kits as gifts so I haven't used them myself but the recipients were very pleased with the kits.

I found the Invis-ID marking Kit to be an added value to our home investment. And recommend this product to others near by.

I purchased this to mark items in my office at work (I've had a couple go missing recently). It works as promised. Writing is nearly invisible on almost every surface on which I've tried it. It is somewhat visible on very smooth plastic surfaces, but that's to be expected, and it will go unnoticed if you aren't looking for it. I had one issue initially with the key chain LED light where it intermittently refused to turn on no matter how many times I clicked it. After taking the thing apart and putting it back together it seems to work fine ever since. I was wary at first about putting it on my key chain, fearing I would accidentally turn it on in my pocket and drain the batteries. But it seems well enough designed so that I haven't turned it on by accident yet (knock on wood). Overall this is a great product.

Nice. Meets my expectation. Thanks

Useful.