The big difference between the PBT and the breathalyzer at the station is that the results from the station breathalyzer are what will be used to revoke somebody’s license, and the result of that test can be used in court to prove intoxication. The machine used in Oklahoma is the Intoxilyzer 8000.
The PBT is not considered scientifically accurate enough to use for the purpose of license revocation. There are numerous models of PBT, and there is no standardization. In contrast, the model of the breathalyzer machine used in Oklahoma is the same all over the state. There is a standardized procedure for administering a breath test on the Intoxilyzer, but there is no standard method of administering a PBT.