A scale
A protractor is used to measure angles.
It's a grade B steel alloy , used for tool making i believe.
In some grading systems, it would be, but there are many grading systems used where it would be a different grade.
There are many tools used in Plastering, though the primary tool would be the Trowel.
A item which is used on a regular basis. For example, a hammer would be a common tool for a builder.
Basically the tool would be used for someone to cut and harvest the crops when they are ripe.
A punch down tool is used for inserting wire insulation-displacement connectors on a punch down tool. It is a small hand tool that is used by network and telecommunications technicians.
In AP style, you should write "eighth grade" when referring to the grade level. The term is not capitalized and should be spelled out in full. For example, you would say, "She is in the eighth grade." If used as an adjective, it would be "eighth-grade," as in "eighth-grade students."
I would say the average grade of oil used in a Duramax is 15W40
A balance is the best tool for measuring mass.
A protract is a tool used in math class. You generally start learning how to use it in 5th grade. A protractor is used to measure the angle between two lines that intersect.
Microscope