JASTEK Portable Breathalyzer Tester with 1000mAh Rechargeable Battery, Personal Breathalyzer to Test Alcohol for Home, Party and Professional Use, Includes 10 Mouthpieces, USB Cable, and Storage Bag

Great little device to have on hand if you are with a group of people and anyone decides they are planning to drive.

I bought this as a safeguard for myself to have in my vehicle when I'm out for the night. I don't go out pounding beers, but if I want to make sure I haven't had too many I like having this with me. It comes with a nice case to store in. The times I've used it, all the reading are always in the same general range. It asks to take multiple readings and then average them out to have the most accurate read, which is always right around the same value. To check the accuracy, I entered my weight and height in an online estimator and it reads extremely close to those estimates. Now, I'm not a professional or have access to one used by authorities, but in my opinion this will at least give you a ballpark of where your limits are at. Even if you have it to make sure you're not getting too out of hand for the night, it's a nice tool to keep with you to be responsible.

Waste of money. Stopped working after a using a few times. Wasn't giving accurate readings and then wont even turn on. Out of return window so I contacted Jastek for warranty service. They asked for more information and then NOTHING! Won't respond to my followup emails. You can do better than these scammers.

The JASTEK Portable Breathalyzer Tester is a hit at parties, adding a fun twist to the evening. Its 1000mAh rechargeable battery ensures longevity, and the inclusion of 10 mouthpieces makes it sanitary for group settings. The thoughtful addition of the USB cable and storage bag guarantees easy transport. However, while it's entertaining for gatherings, I would caution against using its readings as the sole indicator for one's ability to drive. Safety first! Still, a fantastic product overall. Highly recommended for party fun, but always prioritize responsible decision-making.

Seems to work very well if you follow the directions. Keep in mind, this measures blood alcohol level so if you use it right after doing shots it's probably not going to read anything. When I'm feeling tipsy I give it a blow to see where I'm at. Depending on the results, I'll have another cocktail or a water.It's a great way to not let yourself go overboard. My party guests also got in on the action. It's fun and sometimes unexpected to find out who scores the highest.