Your Cart is Empty

The Pocket Engineer - Wallet Ruler and Conversion Reference

Always be ready to measure, calculate and fix anything with The Pocket Engineer. 

Packed with features in laser-cut stainless steel the size of your credit card:

  • 26 unit conversions, 7 equations, and 10 physical constants to save you time looking up references in mechanical, civil, electrical, industrial, nuclear, and materials engineering.
  • Doubles as a wallet ruler and protractor.
  • Photogrammetric ruler to calibrate length and tilt in images when used as a scale in field or lab work.
  • Pipe inner diameter measurement from 0.25"-1.25" and machinist scale with 10-mil resolution.
Shipping times & rates

Free shipping in the USA! Typically arrives in 5-15 business days. Standard shipping (with tracking) available for about $3 (3-7 day). We ship to Canada, the UK, EU and many other countries around the world. Go to checkout to see the rates and availability for your region.

Still not sure if you want one? We offer free returns of this product within 30 days of purchase if you're not happy with it! Grab it today with no risk and feel the difference yourself.

Bulk Orders

Bulk classroom discounts and group/logo customization are available by request. Bulk pricing starts at 10 cards and custom logos start at 100 cards.

Customer Reviews

Based on 42 reviews
Nice gift item for brother in law

Took a very long time to arrive, however (hence one star knocked off)

Mary Brophy

The Pocket Engineer - Wallet Ruler and Conversion Reference

Eunice Woo
Good quality products

It's a gift for my nephew who studies aviation engineering and he likes it. One of the product is a measurement conversion ruler and it is made up of good quality stainless steel and very handy.

Stephanie H.
Great Gift

Bought this for my partner for a graduate gift for his environmental engineering degree. He absolutely loved it, but wished I had bought it sooner as it would have also been a great tool while in school! Perfect gift for any engineering student or graduate!

Luna K.
Looks great!

It will be a gift, but it feels well made and everything seems clear. Love it!

Carbon-neutral shipping with Shopify Planet
Carbon neutral shipping on all orders
shipping emissions removed
That's like...
miles driven by an average gasoline-powered car