It's "a pair of tweezers". This small tool consists of two parts, and it only has a plural form.
It's "a pair of tweezers". This small tool consists of two parts and only has a plural form.
You should pluck your eyebrows with a pair of tweezers.
You should pluck your eyebrows with a tweezers.
The indefinite article "a" cannot be used with plural nouns, but you can use other determiners, such as "a pair of", "the", "some", "these", "both", etc.
You may need to use a pair of tweezers to pick up the pieces
These tweezers are really useful.
You can also use the expressions "two pairs of tweezers", "three pairs of tweezers", etc. to count these objects.
She bought three pairs of tweezers this morning.
Omit the determiner, however, when using this term in a general sense.
Tweezers are usually made of various metal alloys.
Be also aware that being a plural noun, the word "tweezers" takes a plural verb. For example, we say tweezers are, not "tweezers is".
These tweezers are very cheap.
This tweezers is very cheap.
A partial list of tools and instruments that also consist of two parts joined together, and therefore take "a pair of":