Very imprecise, and i got many different readings for ...
584584
Very imprecise, and i got many different readings for the same object when taking the object off and putting the object back on.
584078
I wanted so badly for this thing to be reasonably accurate, as I really like the backlight for reading the device at night. But alas, the humidity accuracy is just awful (I have an older, very accurate device to compare it to). Temperature isn't so bad; it runs 2 degrees low which I could live with. But humidity runs consistently high by 12 to 13 percentage points - not even close to accurate. Stated accuracy in the instructions is "+/- 8%," so even expected accuracy isn't that great. Maybe I'm expecting too much from a device that's made in China, I dunno.  At any rate, it's going back from whence it came.
3634738
When this unit was lined up with 5 different sensors and the WeatherAtHome station,
I expected that the readings would be the same but they were not. For this reason  I
do not trust the accuracy of these units. I have returned all of them for a refund.
693940
Very inaccurate!
It took a day to show that my fridge is 45+ degrees which is impossible, all my food would have spoiled. In my opinion the reading is off by minimum 5 degrees.
2125482
I have purchased 3 of these dual meters. All work fine. However just for the heck of it, I put all 6 sensors in a single bucket of water (after calibrating them) and they vary by more than 10%. (TDS of the water was around 220, and the sensors showed from 200 up to 220.) The description claims 2%. But that is a 10% range. So it's not as accurate as claimed.

Also during calibration I could never get both sensors to read the same, they were off by 10 points between them.

Still love them, but now I know the accuracy is subjective.
865933
I don't know if I got a kit with bad reagents, But the readings were totally inaccurate. Showed I only had 1ppm chlorine when my other 3 kits showed over 5 ppm. PH seemed to be the same. Got a refund.
1705157
I was very much looking forward to using these convenient looking little gems until they arrived.  All three "levels" provided three different readings on the same surface - in fact, multiple surfaces just to make sure it wasn't my old eyes playing with me.  If you can't trust the reading then it really isn't a level.  Most unfortunate...I sent them back.
3519958
Holy inconsistent, Batman! I have little faith in the accuracy of this thermometer, since there's a pretty big discrepancy between the forehead and ear temps. Since the forehead one is sometimes frighteningly lower (I seriously doubt my body temp was 94.6 degrees), I've been sticking to the ear mode.
2528429
This thing seems to be wildly inaccurate: for instance my volt meter shows 12.32 volts whilst this says it's 11 something and I have no reason to doubt my meter. It charges OK thou'
4383687
Some of the methodologies (and results) were surprising, and frankly from my experience, were far off base. Unfortunately, I cannot use this reference guide in my practice with any confidence.
1499264
I got this because of the gram measurements.  However, it's not consistent.  I've measured the same item periodically to check accuracy and will get a different number each time.
2053066
This is highly inaccurate. I got readings from .23 to .26 grams on a single item. That is not accurate to .01 grams as advertised.
  I tried to return it, but found it is "Not eligible for return."
2107981
Tested my new aquarium water for two weeks and consistently got 0 levels for waste and byproducts and pH readings much too high. Tested my tap water with this kit and got the same basic pH readings, which didn't make sense. Compared it to a strip and the ammonia, nitrate, and nitrite readings were much higher in the tank and the pH was neutral. On a strip test, our tap water read 0 levels for other chemicals, and neutral pH. I bought this for more accurate results, and I may have let my waters get to dangerous levels of chemicals.

I would not recommend this kit. Perhaps if you did some quality control work when you first get it, you might be able to trust it, but I will have to return mine. (Purchased from PetSmart)
3763258
This unit is not quite precise enough for me, I get multiple different readings from it. But it is close enough, definitely not good enough for government work.
2473475
Not sure how accurate this is.  I wouldn't recommend it.
1696798
Most of the 2nd functions on this calculator of the functions in this calculator never worked accurately for me.
33478
pretty inaccurate at times. can re wieght the same thing over and over and get a multitude of different masses