BACtrack BT-S75 Professional Breathalyzer: Accurately measure your blood alcohol content between the ranges of 0.000-0.400% with this breathalyzer. The 4-digit LCD display is simple to read and understand. Do not use this product as a tool to determine whether you should operate a motor vehicle or equipment. Always have a designated driver when alcohol is being consumed.
Nice little device to have at party or when out with friends. Some may seem the number is low or high but that depends on persons alcohol tolerance. Some feel bad at .15 others may barely feel it. Be sure to wait 15 mins or so after any drink or food to get best results. If you don't, the results will vary and not be accurate. Easy to use by just blowing till it beeps and wait for the results.