>Draw a key with the pen

Sure? Does not seem like it would be helpful at all right now, but as long as you don't have to think about H.N. you would be glad to waste time like this.

After drawing such a pointless thing, you assume that the PEN has about 20% of its INK left. If the big black symbol thing on the PEN was transparent you would be able to actually tell what level it is at OBJECTIVELY, but sadly this PEN is just too ANNOYING to be even somewhat practical with its design.