Guth Laboratories has developed high precision, all electronic simulators to calibrate and standardize preliminary and evidential breath analyzers used by law enforcement, DOT, NRB, and educational institutions. Guth Laboratories Inc., serving the international market, has available domestic and foreign alcohol breath test simulators and certified alcohol reference solutions used to establish standards. Guth Simulators are listed with UL (Underwriters Laboratories) and SCC (Standards Council of Canada). The model 34C is the only simulator certified for use in hospitals and clinics.

Guth Laboratories, Inc. also has available alcohol breath test accessories, supplies, and service, including fuel cell sensors, sanitary mouthpieces, the smallest hand carried preliminary breath tester (PBT).