 Do you know the Opus 88 Calorodemonstrator fountain pen? If you don't, I think you should know it. That's this week's staff pick. This is Sarah Beth with Pinchelay. Your favorite online retailer. I picked the Opus 88 Calorodemonstrator for several reasons. I love that they offer it in a flex nib now. I love that it's an eyedropper. You can get so much ink in there. And I love their vivid colors. Today I inked it with a new ink from Van Diemen's, the feline collection. Follow for more staff picks.