Your Cart is Empty

How to use The Pocket Physicist

The Pocket Physicist is an every-day carry tool designed for physicists and physics majors. We've packed as many handy tools and references as possible into this little laser-engraved stainless steel card to make your homework and technical work a little easier every day. 


pocket physics equation reference toolpocket card for physical constants and equations

1.    Protractor: Angle measurement and drawing tool

The left front contains a 180 degree arc for measuring and drawing angles. The long lines are every 10 degrees and short lines are every 5 degrees. The straight line cutout denotes 90 degrees and can help to quickly draw right angles.

To draw or measure your own angle:

  1. Align a starting straight line to the flat edge on the outside of the tool.
  2. Add a center dot to denote your vertex, in the gap at the center of the arc tool.
  3. Add a dot at the angle you wish to draw. If measuring, find the angle where the line to be measured intersects.
  4. Slide away The Pocket Scientist and use the straight edge to connect your dots and complete your angle.

2.    Compass: Arc drawing tools (inches and centimeters)

The through-holes lined up with major inch and centimeter markings are for drawing arcs and circles of the corresponding radii like a compass.

To draw a 6 centimeter radius 60 degree arc:

  1. Create a vertex, 0 degree and 60 degree dots using the angle drawing tool described above
  2. Line up the half-hole at 0 cm to your vertex dot and the 6 cm hole to your 0 degree angle dot.
  3. Using two pencils (or one pencil and a sharp narrow object), put one in each hold and with a slight inward pressure drag the 6 cm hole in the desired direction until it covers approximately 60 degrees. Keeping slight inward pressure ensures the arc does not come out jagged.
  4. Use the straight edge to connect your vertex and 60 degree dots, then extend the line out until it intersects your new arc. Simply put a dot at the intersection if you don’t want the connecting line.
  5. Erase any arc past the intersection point.

To draw an arc with a 0.5 cm, 0.5 inch, 0.25 inch or 0.125 inch increment:

  1. Repeat step 1 above.
  2. Instead of using the edge half-hole, start your vertex at the sub-integer hole and count forward to the desired radius, remembering to subtract the distance from the edge to the hole of your vertex.
  3. Repeat steps 3-4 above.

4.    Ruler

The centimeter side is marked to each 1, 5 and 10 mm while the inches side is marked down to the 1/32nd inch where each smaller unit has a shorter mark line. Note that the origin (zero) side starts flat (flush) to the edge of the tool. This allows you to easily measure the height or depth of an object on a flat surface. For the highest precision on paper, start your line at the “1” marking instead of the edge.

wallet ruler for physics majors with maxwell's equations

5.    Tiny flathead screwdriver

You might have missed this one! The bottom right corner (from the front) is flattened. You can use it to unscrew some set screws in a pinch. Don't try to unscrew anything drilled firmly into wood or you'll warp the card. Even though it's steel, it's only 0.5 mm thick. We wanted to use Adamantium, but couldn't find a supplier. 

6.    QR Code for bonus content

Scan the QR code with your phone each calendar month to view a private page just for card holders. Think of this as an exclusive bonus of being a card holder! Each month, we’ll replace the page with new content such as fun science nuggets, STEM jokes, new resources we’ve found or created, news or upcoming events and discounts on new product launches just for card holders! Our goal is to bring you value, fun and happiness with every scan.


Want to find more cool tools for physicists and physics majors? Visit our top-ranked "Gifts for Physicists" shopping list which includes products from all over the internet.