T&F 1 Pc Invisible Ink Gel Pens Multifunction Security Marker LED UV Light Magic Marker Ballpoint Creative Secret Pen School Office Supplies

Copiar en un exámen nunca fue tan fácil 😜

Damit kann man eins A Spicker schreiben

Il prodotto si presenta bene. Funziona discretamente ma la pila si scarica facilmente e dopo qualche tempo le scritte tendono a non riflettere più.

I mean it does what it says on the tin: invisible ink. The uv light on the top is helpful though not very strong. Only annoying thing was the sticker which was impossible to peel off cleanly and has left the pen permanently sticking and ugly. Still, that’s only a minor annoyance and otherwise it’s a decent pen.

The ball point scratches the paper which means the messages are visible under normal light, and the ink is barely visible under UV light. Not fit for the purpose it's being sold.