One.
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You do not need "white rods", you need a tape measure or a ruler to measure the lenght of your thumb.
Rule of thumb... about half. Approx 2cm to 1inch
A digit is like a finger or thumb. Each limb has 5 digits. 4 fingers and 1 thumb or a big toe and 4 other toes.
No, I did a science project, I got many fingerprints. A lot of them were the same but not all. Some had crazy prints! I had 25 prints and about 5 had different prints
A span is 8" or 0.67 foot. That is an informal measurement from the tip of the thumb to the tip of the pinkie on a average spread hand.