A pen can last more than a year. If you orefer fiber pens, they are available from 1. If you orefer fiber pens, they are available from 1. Beautiful Vintage Classic 1960's Bakelite Taylor Barograph Excellent Clean Charts Ink Instructions Test Chart In pristine condition a beautifully preserved, classic and elegant Taylor Bakelite-base 1960's barograph with test chart, 52 blank charts, ink, metal nib pen.