Liquid sensors not believable
925629
Purchased this specifically for the liquid sensors.  They are raised and glossy, nothing like an original Apple liquid sensor sticker, which are flat.

The "Do Not Remove" sticker is more believable, however, most are off center.
2382503
The temperature reading is at least 20 degrees too low therefore, the TDS must also be off. It does give a relative reading. The water from the osmosis System is much lower than regular tap water.
967492
This product is hugely inaccurate.  I took the temperature of a boiling glass pot of water, which was clearly boiling quite rapidly.  I was execting the device to read near 212 degrees fahrenheit. This product read out 175 degrees on a boiling pot of water.  It was a little better at cold temperatures.  On frozen water (32 degrees F), it registered  25 degrees F.

In my opinion it is good for nothing more than a toy laser pointer.

Caveat Emptor
772935
I bought two of these for making nougat.  I just checked them both in the same pot of boiling water:  one read 224 F and the other at 214 F.  Unless the laws of nature have changed, both should have read 212 F (100 C).  I am disappointed that I will now have to convert the temperature I see and then still wonder how accurate a reading I'm getting.  They also require a significant amount of liquid to get a reading as well, so they may not be helpful with small batches.
3153842
Not to be used to test pool salinity levels for chlorinator.  Does not give accurate levels for this type of use.
3100269
After using only 3 weeks this summer the computer chip what I believe is for the humidity sensor was lying in the water bucket. The humidifier is still operating but can not sense whether the humidity is at the right level or not.  I'm hoping the company will send me a new unit.
1424779
Nothing wrong wih Zerowater filtering systems.  Uusually they work well.  However, there was something seriously wrong with the filter I purchased.  It was full of water which indicates it had ben used.  Previous filters were dry as they should be.  Water would not drain completely through the filter, a sign that the filter was clogged.  I managed to produce several partially fllled pitchers.  My TDS test for dissolved solids returned a reading of 100.

I shall shall seek another supplier.
1225303
I do not have a way to test whether if it is the Arduino or my sensors.  I have three sensors that don't work with it (all of them).  I have previously used all of them on an Arduino Mega 2650 without a logic level shifter, so it could be that the sensors are broken and only work on 5V?  or the board is screwed up...

Other than TWI not working, the only other thing is the silk-screening wasn't the best quality.  But I didn't expect perfection for this price, so I can overlook that.
3178456
I am in the middle of the road with this.  I cannot visibly see into my holding tank to know if it made any difference.  All that I can say is that after attempting two runs this my sensors still do not function.  It is really hard to say if the sensor is broken, or if it is fouled and this stuff didn't work.
3033679
While the sensor is a nice feature, it's too sensitive.  Very small movements trigger it.  Also, these units are not very good on batteries.  They seem to have a bout 4 hrs in them before they dim quickly
3107496
I should have heeded the advice I read in the reviews. The thermometer worked for about a month then suddenly started jumping up ten degrees.

The video is the themometer in the spout of my electric tea pot. I want to get the water to 175 degrees. Watch what happens: /Users/ceceliawarner/Library/Containers/com.apple.mail/Data/Library/Mail Downloads/0B0E8ECA-9604-4A9A-8E7E-7BE2CEA5B473/IMG_2860.m4v

I'm not sure the link to the video will work but if not, it shows the thermometer jumping from 174 degrees to 185 degrees.
4024064
Bought first unit, outdoor Sensor did  not scan between channels.  Returned it to Amazon for replacement and second unit the outdoor sensor would not give the correct reading.  When probe was in freezing cold water gauge says 60 degrees.
Returened this unit for credit only!
Recommend LaCrosse check these units out.  I think they are all defective!
587526
A good indicator that it's a piece of junk is that right out of the box the Inside/Outside temps don't match. Just sitting on the kitchen table with both sensors near each other (the internal one and the probe one) with no air movement, no sunlight, nothing to throw off the temps ...and the temps are sometimes 3 or 4 degrees apart, sometimes fluctuating to within a half degree of each other, then back to 3 degrees apart? ....yeah, not much faith in it at this point. Wow.
4901084
I bought this because it comes with 2 sensors. I need one for my wine bottle cooler and the other for my upright freezer. Sensor #2 for the freezer works great but sensor #1 does not work that good. Sensor #1 will stop giving good signal about 5 feet away or when when it in the wine cooler. I will be calling the company for a replacement. Make sure you buy AA lithium batteries for the #2 freezer sensor.
3472852
You are better off getting the cheaper items to test your water. If you happen to get a little water in it accidently, it will no longer work.
3898983
Had this for a couple months now, and the temperature never updates.  Tried reinstalling at the advice of tech support - same problem. Doesn't appear to be ready for prime time, and makes me worry whether the leak detection will work as advertised.
3866616
This moisture sensor arrived OPENED. The packaging had clearly been opened up, even though it was sold as new, 'fulfilled by Amazon'.

Worse yet, the item did not actually sense moisture.  It showed '4' even when put into a glass of water. Now I think I'm correct in saying that when a moisture sensor tells you a glass of water is only 'slightly wet', it's not very good. Of course, my soil also registered a consistent 4, regardless of anything. The only way to get the moisture sensor to work was to completely covered the probe in soil - putting it in very deeply (so that only the green part is above the surface), and even then, it was extremely flaky. I don't know if I got a bad unit, but between this thing arriving open and it arriving broken, I am definitely not satisfied.