Premium AL7000 | Professional-Grade Breathalyzer | Accuracy with Innovative Replaceable Sensors | Replace Sensors, Precisioin Sustained | DOT & US Coast Guard Certified | Basic Package

Recalibrating these annually is essential if you want to be able to rely on the numbers it gives you. The one I had before had to be sent back to the manufacturer to replace the sensor. This one makes it super easy to insert a new sensor once a year. But beware: the replacement sensors have a limited shelf life, and some sellers are offering sensors with a lot less than 12 months left before they expire. And of course they don't give you a prorated discount for the months you aren't getting.

Works well and is consistently accurate and simple to use. Have used several others in the past which while no cheaper were essentially inaccurate toys (eg BluFire etc). I’m in the medical field and bought this for scientific interest; it is consistently repeatable and accurate. It is useful to correlate one’s perception of inebriation versus reality. Recommend.

Perfect for what it is.

We purchased this with the goal of checking our teens. I was OK with a small margin of error, but what I found was that this device was not reliable at all.Essentially I tested as follows:1. Consumed 4 beers within 1.5 hours2. Waited 30 minutes from the point of my last beer3. TestedThe results were continually a BAC of 0.0%This of course is not satisfactory as I would want to know if my kids had consumed as much.I am not sure that there is a good consumer priced solution, but this is certainly not it.As a side note, I did email the manufacturer and never received a response. So not only do you get a dysfunctional product, but you don't get any customer service.

I've found this product extremely helpful. For those of us who need to watch it closely, in the morning (on the way to work for instance , or anywhere) is critical. This little guy has been immeasurable in it's information, and I have learned a lot from it. It's not 'perfectly' accurate I'm sure, but neither are the field breathalyzers the police employ on the street. but it sure takes the guessing out of it. And yes, it can give variant readings one test after another, but it's a handheld device and meant to be a guide, not a piece of evidence.A good thing about this model- you don't need to send it in for 're-calibraton' which can take nearly 2 weeks. you simply order new sensors ahead of time, replace them yourself (super easy), with no downtime and less cost to you.I can only imagine the some of the folks posting awful reviews up here with gibberish readings- they likely had a bad/old sensor. if they paid super discount prices, that may have been why.Either way- I absolutely recommend this product if you like to drink, and operate machines, especially cars, trucks and boats. don't trust how you feel, trust the thing in your pouch that doesn't care.

Purchased this to use for my Tugboat business. It is very easy to use and gives accurate results.

Please read!! This device is extremely accurate. However, you can't take a shot then expect it to function properly, actually you might ruin its accuracy. Wait 10 minutes or so before using it and it'll be worth it's weight in gold. I can blow a .068, hand it to my girl and it'll blow .000, then blow again and get a .068. It works very well and I'm probably going to buy another so I can keep one in the house and not have to go to the car to see if I'm alright to drive.

This breathalyzer is phenomenal. I got it because my work (the world's finest Navy) started randomly breathalyzing us which sucks but it is always a little better to know in the morning if you are going to pop. This is actually the same model the Navy uses. The biggest things I have noticed is that you need to wait at least 15 minutes before your last drink to get an accurate read. I think the calibration and reads are on point. They will sometimes seem a little high but I am not convinced another breathalyzer would give a different reading - I think it is just the nature of the product. Overall, I got this for a great price and have been completely satisfied.