Guess me who?

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Across
  1. 5. length of the thumb
  2. 6. standard to measure time and angles
  3. 7. SI basic unit for volume/capacity
  4. 9. length of the both arm when stretched horizontally
  5. 11. distance between the tip of the thumb and the tip of the small finger when the fingers are spread out
  6. 14. English system basic unit for temperature
  7. 15. SI basic unit to measure amount of substance involved in a chemical reaction
  8. 18. earliest unit of mass
  9. 19. SI basic unit for electric current
Down
  1. 1. distance from the point of the elbow to the tip of the middle finger
  2. 2. distance from the heel of one foot of the other in one stride
  3. 3. width of the pointing finger of the middle finger
  4. 4. SI basic unit for time
  5. 8. length of the arm from shoulder to the tip of the middle finger
  6. 9. distance from the heel to the tip of the great toe
  7. 10. the science of measurement
  8. 12. SI basic unit to measure intensity of light
  9. 13. SI basic unit for temperature
  10. 16. SI basic unit for mass
  11. 17. SI basic unit for length