The Audit Risk Meter gives you a visual indication of your possible audit risk.
It's exclusively available in TurboTax Deluxe, Premier, and Home & Business Desktop versions and can be accessed on the Review tab (under Audit Protection).
Please note that the IRS randomly reviews a small percentage of returns regardless of audit risk. In addition, the IRS's focus on audit risk factors changes periodically and is not made public.
As a result, a reading of "low" is no guarantee you won't be audited, nor does a reading of "high" necessarily mean that you will be audited.