Okay, this isn't 100% foolproof, and that's already a bad start, but with very little audience management, you can achieve a very high level of reliability. I wasn't expecting this method, but it's interesting. Although the box contains enough material, you're basically paying for the reveal and the tutorial. The good part is that you can then create your own notebooks. It's also so simple to use that it's fun. Classic pencils and ballpoint pens work really well; Sharpies or gel pens work, but they create more problems with the printing. It has up to 6 separator sheets, although 3-4 is optimal. If the viewer notices that what they just wrote has been marked on the next page, they can tear it out, and everything will remain hidden. The print quality is a bit more difficult to "read" and depends on variables that define the final quality, as with all printing devices of this type, but it's remarkably undetectable to the touch and sight. Perhaps it's not the holy grail of visual appeal, but I'm very happy to have found and discovered it. If you're curious, buy it; it could be a great EDC (Everyday Carry) gift.
The instructions are clear and concise, explaining a lot, like the history and how it was discovered.The only drawback for English speakers is that the audio is in Spanish with embedded English subtitles.
