Humidity Accuracy Is Terrible
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.
4127163
We have bought two items and when we turned on the equipment the data seemed to be good but when the relative humidity when above 80% the data changed from each item, one 94% and the other 83% to much difference for 2 devices in the same place, we also saw the error test but the equipment is new, we will check this product with our electricity technician and also will need to calibrate the product but it appears that it was not calibrated from factory.
4680558
Humidity section/read out extremly in accurate.
all else works.
returned..but a hssle to return...l..wanted photos. readings etc..etc.. All Sun did not pay for return postage..but promised would.
 suggest another brand..made in China..shipped directly
170880
The unit would be great but I calibrated the humidity on it and replaced the batteries and everything go reset.  So everytime you change the battery you will have to re calibrate it.
3041327
I am unimpressed. OK, I know it was cheap...but the accuracy of the humidity sensing element is off by 6-7%. Do yourself a favor and buy something else.
2945977
I purchased this item to test my home for proper humidity level but when I compared the two I had purchased against a more precise item --a professional unit a friend had-- one read 9 per cent higher and the other 13 percent higher than what I was comparing against.  One unit was precise for the temperature but the other kept changing between the room temperature to 20 degrees higher than the actual reading. Other than the different readings I am getting and its lack of a reset switch this meets my needs.
2245907
Bought this hygrometer for my new 100 cigar glass-top humidor (which is wonderful).  The specs were great: accuracy to 1% humidity, no calibration required, max and min reading memory.  However it did not work as advertised.  first day it recorded 55 - 120 degrees in my humidor!  Clearing the memory did not help.  Placing a second (desktop) hygrometer in the humidor and the Caliber 3 was way off.  Had to throw the Caliber 3 away.  My stash of cigars is too expensive to trust to this.  Ended up buying the round digital unit which can be calibrated with the salt test.
1971647
I didn't expect scientific-instrument precision from an inexpensive hygrometer like this. But this one was so far off as to be useless. I have 3 other hygrometers, and bought this for the dewpoint reading (which it estimates from temperature and % humidity). At a point when my other meters were all reading near 60% (71 deg F temperature), this one was showing 72% humidity.

I returned it as defective.
762792
Temps. were not accurate On either item & humidity was 20% to 60% off on both items. We traveled from humidity ranges from 80% down to 4% both items read 20% to 30%. Very disappointing.
3016062
According to this thing, it's 158 degrees with 99% humidity. We're all toast!!!

I've had this for three years and it always showed high humidity even though our dehumidifier showed levels 20-30% lower. Last month, it remained at 99% humidity, and this week, it's hotter than usual in the basement...about 100 degrees hotter. New batteries didn't help the situation. Maybe three years is too long to expect this to work, but I had higher hopes.

In better news, it appears we're not actually toast - turns out this thing is just an inaccurate piece of crap. Carry on!
4587100
Request to Return for the reason:  1. Does not functioning  as described in the manual.  2. Shows wrong humidity value.
957323
Incorrect R/H humidity reading when having Frigidaire dehumidifier reading side by. The margin of error is 20% comparing the reading side by side to Frigidaire.
2220116
The temperature readings do not always comport with my perception of the temperature in the room. And despite the readout being digital to the 10th of a degree, it always reads 69.2, 71.2 or 73.0. Can't judge whether the humidity reading is correct, but I assume it is. It's possible that it's accurate, but I'm not confident in it.
557389
I do not normally write a review on items I've purchased, however, this simple weather system is not close to accurate for outside temperature or humidity.  I followed all of the instructions such as don't put it in the sun rain or near a heat source etc.to no avail.  I finally decided to put it next to the indoor unit that it transmits to.  It was consistantly 10 to 15 degrees different than the indoor receiver.  The indoor receiver was within 2 degrees of actual which in my case was acceptable. The humidity is showing a 20 percent difference from the indoor receiver.
I don't think I will buy another Acurite...
3157494
I have used this humidity monitor for 90 days or so keeps saying low 21%  windows sweating , bought a new brand shows 59%.  POS  Buy another brand.
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.
1455221
This appears the be least accurate temperature and humidity sensor that I have purchase. It is probably accurate to +/- 5 degrees F and +/- 5% humidity.