ComputerGear Caliper Tool Pen Engineer Architect Contractor Engineering Gift Does your pen measure up? This precision chrome German caliper pen does It's a working retractable ballpoint pen with built-in 4 caliper, thread scale and tire tread gauge. Refillable standard pen cartridge. Perfect for engineers, architects, contractors and anyone who appreciates the more measurable things in life Caliper pen comes beautifully gift boxed Unique pen is a ComputerGear exclusive