Be aware that if you report the tools on your tax return, the depreciation you claim reduces their cost basis, so that if you ever sell them, you could have a taxable event. If you could get a partial state deduction but no federal deduction, you may want to consider if it is worth doing at all.
Also, some states have rules about when it is allowed or not allowed, for an employer to require employees to purchase their own equipment. You could look into this if you think it might apply to you.
