While Think Geek’s claims of the Messograf Caliper Pen being “the best looking pen on the block” might be taken as a slight exaggeration, it must be said that it is a pretty good looking pen. It also has some cool little measuring functions built into it – first and foremost is the Venier caliper, but the tire depth and screw thread measurement functions are pretty cool too.

• Made in Germany and is the best looking pen on the block
• It’s a pen, it’s a Vernier caliper, it’ll check your tire tread!
• Retractable ballpoint pen to mark down your measurements
• 4? exterior Vernier caliper (0.1mm metric and 1/16 inch scale)
• Metric screw thread scale and tire tread depth scale, too!

Price: $25 [Geek Alerts]