What is the plural form of the word "tweezers"? If there is one.
The answer can be used for example in the following case:
I have two tweezers
There are some words (pants, scissors, pliers) that only make sense in the plural. The singular form of the word exists, but the singular is never used as a simple noun. Instead, we reserve the singular form as an attribute (a pant leg, a scissor blade, a plier handle).
Tweezers happens to be one of those words. It's already plural, and you shouldn't try to make it more plural. What you need instead is some other word with a normal singular form. That word is "pair".