Abacus-Helped in doing calculations, there were other counting methods. Not that important in the greater scheme of things.
Barometer: I don't understand how this can compete with the othe selections. Knowing the pressure outside?
Broom: This isn't the exclusive method of keeping clean.
Candle: This wasn't the exclusive method of producing light. Light at night wasn't that critical before the advent of electricity. If anything, night time didn't become the part of life that it is today until electricity/lightbulb.
Chisel: This helped man to build monuments. Monuments usually for Gods. It didn't help innovate anything else. Gave us a new way to write or do record keeping.
Compass: Great for navigation obviously. Too bad that most discovery occured without one (comparatively).
Condom: Impact on humanity? Birth Control has been around a long time before this. For STD prevention...well ok. But STD's aren't mandatory.
Corkscrew: Not even close.
Eyeglasses: This is a great invention, but it doesn't impact humanity since people with good vision would have progressed the world regardless.
Fishhook: Net fishing existed. This isn't that big.
Floppy disk: Gimme a break.
Gas Chromatograph: Naaa
Harness: Nope
Knife: Now this is a good one. Knife came in handy.
Lathe: No.
Level: Like the chisel, it was handy in building monuments and structures. And these were often not involved in innovating other things. Perhaps certain structures like aqeducts etc...still, not major impact on humanity.
Longbow: This has been in my opinion, detrimental to human civilization. This was another innovation and weapon of war that allowed monarchies and aristocracies to maintain power.
Mouse: Like the floppy disk, nope.
Needle: This was big in for the world of sowing. We could then make garments to wear. But this is secondary to the invention of rope/thread.
Paper clip: Not even close. This must be a filler item.
Pencil: Writing existed in many forms. Chisel, painting, quill pen. Cavement painted with blood on cave walls. That is a form of communication.
Pot: As in weed? ***?
Remote control: No impact, except it made our society more coutch potatos.
Rifle: This is the item that has the single most greatest impact on human civilization. The entire concept of human rights does NOT exist without the rifle. That is more important than anything else. Democracy doesn't exist without the rifle. Our entire way of life today rests almost soley on the rifle. Prior to the rifle, it was impossible for the poor, the weak, and the unskilled to overthrow tyrannical rule. Kings, Emporers, and such all ceased to exist. Aristocracies ceased to exist because of the rifle.
This empowered ANY man to be able to physically fight any other man. This brough parity to all of human kind. Prior to this, swords, armor, and the skills were kept the domain of the rich and powerful. This ended the monopoly of power, which changed mankind from its reduntant cycle of tyrant after tyrant.
Saw: This increased and improved our building capability. Pretty big.
Scale: Measurement tool, like the abacus, it helped form early "markets".
Scythe: mmmm, not that big imo. Different parts of the world lived on without farming. This isn't that big.
Spoon: People used to eat with their hands. While it did impact humanity, a lot of people still don't use these.
Sword: This, like the long-bow, hurt mankind. This is a weapon of great skill and power. It is a weapon that is only effective when used in groups, like militaries. As such, it had no usefulness for the poor, the minorities.
It did one good thing. Without it, like another noted above, we wouldn't have gained the knowledge in metal working and materials to then develop the firearm.
Syringe: Very good, but there are more than one way to take medicines.
Telescope: This is huge. This impacted humanity by changing our world view, and how we see ourselves in the "bigger" picture. It has raised new questions, and that has effected who we are.
Toothbrush: Good thing, not an impact.
Watch: If they mean "time keeping", that is huge. It is critical to the modernizing of our society. The progress of business. The progress of some innovation etc...However, strict timekeeping wasn't absolutely critical up until 150 years ago. Maybe more recently.