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Follow the instructions is important to ensure set up correctly. Response to the blow is quick and the result seems to be a good indicator to the degree of drunkenness.
Verified purchase: Yes | Condition: Pre-owned
This was easy to set up and to use.
Verified purchase: Yes | Condition: Pre-owned
works great
Verified purchase: Yes | Condition: New
It works, but the instructions are ambiguous.
Verified purchase: Yes | Condition: New
Great for morning after just to be safe particularly if up early.
Verified purchase: Yes | Condition: New