Hurt and Heal 21 - What do you take to the 1600's?

So, you're about to be transported back in time to the 1600s. You will return in one year. You have been asked to document your trip. You may take one of these items with you (and the technology to use it (electricity, etc)) to use however you wish. However, if you take one item, its technology will develop much faster, and the world to which you return will have had this technology you took developed in the 1600s.

What do you take?

(100) Computer
(100) Handycam
(100) Telephone
(100) PDA
(100) Sketchbook
(100) Bolt-cutters
(100) Diary
(100) Lots of LEGO bricks
(100) Still image camera
(100) Dictation machine
(100) A knife
(100) A musical instrument
(100) Radio transmitter
(100) A rubbish bin
(100) A letter opener

Assume all items have a double in the future which gives the report back to the scientists who sent you there. Assume all items have unlimited storage capacity.

It is your job to think of uses for each of these items, as well as what you think the effect might be.

Standard rules - one play per day, hurt for 10, heal for 5, last one standing or first to 200 wins. If you hurt and heal the same item (for a total hurt of 5), the hurt takes precedence, so if you have, say, (10) Sketchbook, and want to hurt it for 5, you can't. It would die with the hurt for 10, and you can't resurrect dead items.

Let me know what you think of this idea!