tool
microscope
An ophthalmoscope is a tool used by eye doctors to see the interior structures of the eye, including the retina, optic nerve, and blood vessels. It allows them to detect conditions such as diabetic retinopathy, macular degeneration, and glaucoma.
The light we see from the moon is actually sunlight that is reflected off the lunar surface. The moon does not produce its own light.
Yes, it is possible to see the Aurora Australis from Tasmania, especially in the southern parts of the island. However, clear skies, minimal light pollution, and strong solar activity are necessary factors for optimal viewing conditions.
An electron microscope is necessary to actually see a virus.
Microscope.
a sphygomanometer is actually a tool used for measuring blood pressure in your arteries. the "instrument" refers to a tool, but i do see where you got that.
All chisels, saws and awls are usually very sharp.
tool
Validity is the extent to which a measurement tool actually measures what we wish to measure.
tool
The correct spelling of necessary is necessary. Very simple. ( Actually it's in the question.)
The Target Spruce Tool Storage Shed includes all necessary hardware to assemble and secure the unit.
He considered the pen as the only tool necessary to liberate the Philippines from Spain. He considered it mightier than the sword (revolution).
A cutting tool is actually not necessary. One can twist the spur and the hard outer "shell" will come off easily. The blood vessels inside are not damaged and a smaller spur will be left.
Absolutely