This lawn mower is considered a business asset. You'll need to be using the TurboTax Self Employed online edition or TurboTax Home & Business desktop (CD/Download) edition.
Use the instructions in the TT FAQ below to enter all of your son's business expenses into the Schedule C you prepare for his business. You'll see a category for Assets as you go through the interview.
https://ttlc.intuit.com/community/entering-importing/help/where-do-i-enter-my-self-employment-busine...
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*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
