in addition to the above, it's how much you use the equipment for work only.
If, for example, you had to buy a computer to use for work. If you only used it for work, then you could take 100% of the value. But say you use it at home too and for personal email. Then maybe it's only 50%
The gun is going to be that way.
Also, you'll need to itemize your deductions, which requires a full 1040, and unless you have a home loan (with the interest deduction), it's almost impossible for a typical wage slave to beat the standard deduction.
See your accountant.