Confidence level, as expected, is ZERO
592550
A very comprehensive book that proves it's title convincingly, but tends to go off on tangents. These tangents, however, are necessary to in order to make the jurisprudence-speak and court procedures easier for the layman to understand. In the naive USA of the 50's and early 60's the WC and lone gunman scenarios were rather easy to pull off. They did not take into consideration (perhaps they were naive as well) the staunch determination of the first researchers who curry combed the WC report and found, to their dismay, the intentional ambiguity and blatant disregard for any reasonable, logical deduction. We should be eternally grateful for these patriotic individuals who, at no small risk, paved the way for publications such as Barry Krusch's.
1558787
I tested this alarm when it arrived by allowing a bit of water to flow in a sink.
Performed as expected.
With any luck, I'll never hear a peep out of it (outside of battery changes)
3639443
Placed battery in HP iPAQ and charged overnight.  After verifying that the iPAQ saw the battery as 100%, I removed the iPAQ from the charger and tested functionality.  In less than 5 minutes, the battery charge went to 0% and the iPAQ shut down.  Repeated process a couple of times with same result.  Checked against the original battery (which has a life of only a few hours due to age), and found the iPAQ with the original battery gave accurate battery capacity readings.

I'm returning the battery for a refund.
867318
Well, I should have known better, but I trusted you guys.  I read the reviews and decided to go for it.  I don't need much, just something for light bench testing.  This thing is has a very cheap feel to it.  When I took it out of the box, the voltmeter was showing 5V.  No biggie, figured I'd just zero it with the zero screw on the front.  That doesn't work at all.  I put my meter on it and can see that the output is from 2.5v to 15 as it should be.  The meter will indicate to about 7V and that;s it.  I'm going to return it and spend a few extra bucks for something else.
4025658
I ordered this for my business and the employees said that it worked fine when we first got it. Now it constantly says FAIL. You have to keep trying and eventually it will say PASS. I no longer have any confidence in it.
3142751
Tested the amount of chlorine left in the water at work and it reads 0. Thought I made a mistake because I didn't believe it could be working that we'll and still tests at 0. Tested after about two months of use.  I came back and bought more.
3480565
Newly revised review:
=====================
I ordered a replacement to send back the faulty one; technically can't exchange it, but return shipping is covered, so no problem. Received the replacement unit, and it works flawlessly. So go ahead and order with confidence!

Original review:
----------------
Just like Rachel Barr of Fort Davis, TX, I found that the device only works properly when partially plugged in to the USB port. If I plug it in all the way (i.e., when it sort of "snaps" into the jack) then Windows 7 doesn't recognize it as a viable USB device. Unlike Rachel, however, if I plug it in all the way and then gently pull it partially back out, Win7 still won't recognize it. Instead, I have to completely unplug it, then carefully insert it almost, but not quite, to the point where it snaps in. If I go too far, then i have to start over. I get the same behavior whether I plug it into a powered USB hub or directly into my computer.

Needless to say, this doesn't inspire confidence that my data won't get hosed at any moment during a transfer. I am sending it back, and ordering the same item again, hoping that this was simply a fluke. I will revise this low rating upward when (if) I get one that works properly.
899096
Error of calibration from the box, which is fine. Thing is, it won't calibrate. Followed instructions, indefinitely flashes 10.000 grams and never changes to the 20.000 grams display like it should after I put the test weight on it, then pass.  Sometimes it will give me a nice "err" message then flash "0 -Ld" (not a listed error) and count back to 0grams over and over forever. So far a big waste of time, gunna try #2 soon.

Update: New one works perfect and is extremly accurate and useful for reloading. Dunno what was wrong with the first.
3102589
I would rate it a 0 but there is no zero. It is hard to use a case that I am unable to open. I watched the video and Still can not get it open.
3107878
Would never zero. Also always said unstable. It's located in my trash can.
4302532
not as accurate as I had hoped.  Initial reading on startup is off.  Have to wait for it to change.
1003390
This is extremely difficult to calibrate, and doesn't seem to work very well. I get readings with no alcohol of 80-90, so I use this as the baseline, then with several drunken people blowing into it, the reading goes to 130 max (out of 4095 on a Particle Photon). The reading sticks there and doesn't seem to go back to the non-alcohol levels. This is after calibrating the sensor for over 24 hours.
2469035
I added the entire 4lbs to my pool over a week ago and it's still showing as 0ppm. I'm not impressed.
3012732
Received yesterday, worked right out of the box and easy to set up. Not too confident on the accuracy...my blood pressure is usually elevated and when I took it this morning it was on the very low side of normal. I will be checking it against my manual one, but as of now I'm skeptical.
1798348
after 6 months, the zero will "NOT" hold and I cannot adjust at all. i move the adjustments from one end to the other and there is "NO" adjustment.
1505130
I bought this unit on sale at K-Mart. Purchased new C-cells for receiver (chime) unit; installed 12v (supplied) battery in button (sender) unit.
Removed demo-batteries that are used to hear sounds before you purchase. Turned receiver switch to "on".

No sound at all. Checked voltages at each battery terminal (not just the battery case itself.) Full voltages available. Played with DIP switch settings in case the default contact was bad.  Still nothing.

Have lost the receipt. So it's off to Home Depot to buy something that is NOT GE.
4772339
I didn't even get 10% of 2600 before it was empty.

SCAM