I received this replacement unit and it is not as good as my first unit. This unit requires a big long, hard, blow of air to register for the reading. The readings appear to be accurrate.
Looked frorward to having the BACtrack but it was not
on February 5, 2014
Posted by: Ruddybull
from Milford, NH
Verified Purchase:Yes
Looked frorward to having the BACtrack but it was not compatable with iPhone 4 so I returned it. When I can upgrade my phone I will purchase a BACtrack.
I have had the S75 pro for 4 years. I didn't follow the instructions and callabate it correctly, but like it so much that I bought another one. In the Louisiana summer you can't keep too many things in the car. It works fine even the batteries hold up well.