1: Does the instrument use a fuel cell sensor? Fuel cell sensors are more accurate. Every instrument on NHTSA’s Conforming Products List of Evidential Breath Testers uses fuel cell sensors. Fuel cell sensors respond only to alcohol ruling out false positives.
2: Does the device have automatic breath sampling? Automatic breath sampling is a more precise testing method and reduces operator error because the instrument detects the precise moment to capture a breath sample.
3: Can the operator check the accuracy and calibrate the device? The capability for the operator to quickly check the accuracy and to re-calibrate an instrument when necessary means less out of service time and greater confidence in the test results.

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