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Since 1976, Guth Laboratories has supplied high-quality standards, alcohol testers and accessories to the worldwide alcohol breath testing products industry. All our standards and equipment are tested and approved by recognized federal and state agencies such as NHTSA and UL and are traceable to the National Institute of Standards and Technology.
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NHTSA and DOT outline in great detail their calibration procedure
Equipment and Supplies: Gas Chromatograph capable of complete resolution of ethanol in test samples, with heated gas sampling valve. Water bath thermostated at 34 °C ± 0.1 °C. Glass Reference Sample Bottles (300 ml capacity or greater) with Stopper and Inlet and Outlet Air Hoses (see Figure 1). Hoses should be about 1/8'' OD Teflon tubing. Reference Ethanol Solutions prepared using Class A glassware and American Chemical Society reagent grade ethanol or USP grade ethanol. The purity of the ethanol used shall be compared with the National Institute of standards and Technology (NIST) Standard Reference Material for ethanol.
Police get new tool to convict drunk drivers
The 12V500 Duplex Alcohol Simulator retails for $1,359 and delivers a known and precise amount of alcohol to the analyzer before each breath test.
That process lets police know the machine is working properly, said Greater Sudbury Police Const. John Coluzzi, and ensures any blood-alcohol readings it takes are as precise as possible.
With the rise of personal breathalyzer use, calibration of more accurate breath tests still critically important
We have encountered students who have used [personal breathalyzers] thinking they were sober, trying to be responsible, and getting a DUI shortly thereafter,” Letendre said."
Letendre says not all personal breathalyzers are as accurate as the readings we found in our test with BackTrack and warns about a ‘false sense of security’ for drivers who use them.
