While on probation, there can be no measurable amount of alcohol in your system while operating a vehicle. Although, there may be arguments concerning the calibration and accuracy of the testing apparatus.
Agree with the answers above, but keep in mind they (either DMV or the DA) have to prove their case. The questions are what kind of breath machine did you blow into, what was it's calibrations, etc. But the main question is whether that machine can even calculate breath alcohol numbers under a certain BAC. Some machines are not able to calculate below a .02. Something to maybe look into with some attorneys around you.
Disclaimer: This was not legal advice, and in no way formed an attorney-client relationship.
Sign up to receive a 3-part series of useful information and legal advice about DUIs.