How to: Homemade Calipers

Materials needed:

• Cardboard box

• Razor Knife

• Ruler or Square

• Pencil

STEP 1 Place your straight edge along your cardboard seam and edge and use your marker to make a line. Make two outlines.

STEP 2 Use your cardboard cutter to cut out the two right angle forms. Now you have two arms of a caliper.

STEP 3 Attach them together with a paper clip.

STEP 4 Hold your cardboard caliper over the area to be measured so that the points of the caliper barely touch the subject.

STEP 5 Measure between the arms of the caliper.