This is great for when you are working on making a small balsa wood sign for your creepy Halloween house, and since balsa is so soft it also burns very easy so therefore less heat is needed. Too much heat and not only will you blacken your piece you may start a small fire as well!
Say your next project is on a piece of oak, you're making a picture frame and you want to decorate the frame but you do not know how to relief carve on hard wood. No problem. Your handy wood burning pen can help, just dial up the temp to be able to burn into the harder wood. With no other skills then being able to write or draw simple lines and shapes you can burn in a fancy decorative edge. Draw what you need with a pencil and then draw over those lines with your WB pen and presto: instant non-boring frame! Some 00 steel wool and a little stain and you're done.
Now for us miniature folks there are many uses for a wood burning pen since making dollhouses and other small objects requires working with wood. The pen can decorate, write and make textures on many wooden items, but since the heat is adjustable it can also be used to burn designs in plastic, fray cloth for those perfect spooky drapes, burn the edges of a paper document in a controlled fashion for the best pirate map and even burn your signature into polymer clays.