Title: Useless when needed
Product review: The AlcAlert BT5500 is a novelty item and I do not recommend relying on it for an accurate reading of blood alcohol content. The display showed "SAT" (saturated) at least 75% of the time regardless of prior use or level of cigarette smoke in the room. The instructions say to shake it 5 or 6 times but that does nothing to remove the saturation level. Therefore, the item is useless. Pay the extra money for a better device.
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