WAC 448-15-040
Certification.

Any PBT used as described in the preceding sections, must be certified at least every six months. In order to certify a PBT as accurate, the testing shall include at a minimum, a blank test of room air which must give a result of less than 0.005g/210L, and a test of a certified dry gas alcohol standard. The instrument must accurately measure the reference value within ± 0.010g/210L. A record of certification must be kept by the person responsible for calibration. Certification of PBTs can be performed by persons certified by the state toxicologist as PBT technicians, or by factory authorized representatives, provided that the protocol for certification approved by the state toxicologist is followed.