This is the screwdriver in every carpenter's bag.  Mark Whatever You Want™ with the original Sharpie®. Permanent on most hard-to-mark surfaces so you can label, date and sign any food product container or label. 1.0mm tip for fine, bold marking. Pocket clip. Fast drying, fade and water-resistant ink. 

Sharpie pens are the most widely regarded marker out there.  Make sure to add a few extra to your Server Tool Belt.