Probably the desk, the pencil, or the paper.
The most used item in the universe has to be the cell phone. I read a great article on it at all-most.com and it was by far the winner as the most used item.
A box
its lead in pencils :)
The most used domestic appliance is a fridge or stove.
A buck hunting knife is not considered a collectors item. This is because it is used for hunting, and it is not an older item. It is newer, and it is going to be used a lot by most people.
The value of an item depends on weather its new, used, and what condition the item is in. If the item is damaged, it will most likely decrease the value.
Buret
Believe it or not the most used school subject is math because you need math to do everything from eating to driving in the car. You may hate it but you use it a lot so do not flunk out or quit because then you will not be good in life in general.
A pipe,an fire extinguisher,rubber hose
There are a few items that are found on a standard office tool bar. The most used item is the save button.
Celsius is the temperature scale that is used in most of the world.
The item used by Max is the ring of strength.