HUMIDITY READINGS QUIT IN 4 MONTHS.
583551
After 4 months the outside humidity reading is not correct.  Trying to get someone to assist in returning and/or exchanging.  Followed the well written re-set options and still no luck.  Hoping they will come through on an exchange.  Miss checking a couple of times throughout the day.
3164
The temp digits failed after 2 weeks.  Humidity can still be read, but not temperature.
2239312
Worked great at first, save for a slightly awkward mating of the tank to the unit, and expensive filters that require a 24 hour soak before they can be used. Halfway through the first season the hygrometer failed, reading a constant 90%, thereby only leaving constant on mode as an option. After being in storage during the summer and returned to service this winter the fan no longer functions. It is now unusable. This unit doesn't appear to have been engineered or built to tolerate the high moisture environment it creates as it operates. Disappointing for a very expensive humidifier.
2543172
This monitor worked great for about a year - just when the warranty ran out. After that, the humidity readout failed and no longer reports humidity, and the low temperate reads incorrectly low temperatures. In the picture attached, the low temperature reads 9 degrees F but the actual temperature where the unit has been placed has come nowhere near that in the last 24 hours.
1323691
The unit lasted only 3 weeks before it quit working. It now only registers 16% humidity. I suggest finding a different item.
3768468
The unit worked fine for several weeks, then began showing bogus barometric pressure readings such as 33.1 to 36.0 in Hg, etc. Inside temperature is not accurate nor very responsive. The outside temperature reading has been accurate.
2644444
If you are ok with a dehumidifier working for less than a year, then buy this. If you prefer a higher quality device that is dependable and will actually work beyond a year's time, buy a different brand.
849110
No way to calibrate the humidity monitor and only a one-year warranty. I have two of these and after checking the accuracy via the saturated salt test, the older unit reads 61% instead of 75% and the newer (one-month old) unit reads at 71% instead of 75%. Temperature readings are consistent and accurate, but I could get that with a simple thermometer instead of this unit. I will not get this product again, I'm switching to a  humidity meter/hygrometer that can be calibrated.
3512366
The outdoor humidity detector is off.  Otherwise fine.
489044
All 3 of them sometimes jumps 4% to 5 % down and up. Compared to other 2 different brands, their response to the humidity change is little slower. Their readings are about 1% to 4 % higher than other brands that I have.
337802
I had this for a while and it worked well. I question the humidity readings at times. Today it died. I replaced the battery - nothing. Tried a different new battery and cleaned the contact - nothing.
3799267
Four months after purchasing, and with minimal use, the unit has begun to emit a burning electrical smell.  The sensor that says if the floor is clean or dirty has also stopped working, as it reads "green" (clean) when it goes over obvious debris.  If Amazon will allow, this thing is getting returned.
4430836
The problem I've had with most of Oregon Scientific's outdoor weather devices is that they DON'T last very long. I've bought this rain gauge twice, and both times they didn't last more than a few months. I've had the same problem with their anemometers and thermometer-humidity devices.
1307745
I received this humidifier on December 19, 2015. It is now January 14, 2016 and it has already stopped working. I followed the enclosed directions for cleaning, maintenance, placement and use. Almost overnight, a couple of days ago, the output suddenly diminished to about 1/20th of the original output. At first, I loved it as it really helped my sinuses deal with the dry heat of winter in my bedroom. It emitted a strong stream of vapor at first, but now it's sitting there like a doorstop and I feel like an idiot for ordering it.

Wondering if anyone else has had this issue. It's not the motor for the fan that is the issue, its the little metal spot in the humidifier that works to atomize the water. It is barely making a tiny puff of humidity now. Please note that it took less than a month for this to happen. If you DO order this humidifier, make sure to keep the box for when you need to return it. I sadly did not.
630684
Temperature reads similar to another I bought from a store (same brand too), but I bought the other from a store because the humidity read is faulty on THIS one! It has always said 16% for the last few months. My mistake for not realizing the seller said "no returns".
604467
I gave it a 4 star because I don't believe the humidity sensor works right.... I have another humidifier with humidity readout sensor+ another humidistat in the house that read +/- 4% of each other... This machine reads about 20% under the actual humidity in the house
1827459
I have the logger for the tanks (just temperature) and the one for moist rooms (humidity and temperature).  It broke after about 6 months.  Not sure why, but the seal isn't the greatest.  They need to redesign this with external probes instead of internal probes as it would fix the issues.