Not the most obvious way to make settings, but once you get it, it makes sense. Works as advertised so far (I have 2 of these on different humidors and both work fine). Readings match separate humidity sensors closely.

No real complaints, some of the abbreviations in the LED display could be clearer, I have to look up till I memorize but otherwise does the job. I have to say the sensor is very responsive, as soon as I open the door to the terrarium it immediately sense is a change in humidity and activates the humidifier connected to it

Our initial goal in purchasing this unit was to maintain our terrariums high humidity levels, and to run a mister/fogger/water circulator when humidity dropped below 80%. Instead, this unit has spent most of the year unplugged and useless. This is due to the units inability to handle high humidity environments. If the terrarium reaches 100% relative humidity, the unit sounds an alarm. Note, this will tend to occur naturally in any high humidity terrarium when the air cools in the evening. Cooling will reduce the dew point until relative humidity hits 100% and condensation forms on the interior glass. If you have ever seen condensation on your terrarium glass, then you too, have experienced 100% humidity in part of your enclosure. Per the support response, there is no way to disable the alarm. The unit allows you to set a range up to 99% humidity, but if it crosses that threshold, *blang-blang-blang* The alarm sounds. (And personally, I dislike being awoken at 3am in the morning by a needless alarm.) When asked for the reasoning, it was explained that the unit does not handle 100% humidity because the probe is not waterproof nor designed for immersion. This answer clearly shows that the manufacturer has zero understanding of the basic principles of humidity, dew point, condensation vs immersion, nor fundamentals of natural science. We are left with two options... 1) Keep our humidity lower, putting all of our living creatures in our habitat at risk of it getting to dry. 2) Discontinue use and purchase another brand and model. (Obviously, we are going to go with the latter option.) This unit is fine for any dryer terrariums. However, if you have have a high humidity or tropical rainforest type terrarium, I highly recommend that you DO NOT buy this unit.

I use this in my greenhouse. The placement is going to be moved for the second one I buy. The first one locked up the sprayer valve when it got wet.

This device works very well for my purpose of controlling a dessicant dehumidifier. I use this dehumidifier in a large box I built to dry the soundboards for the harps I make. Previous to purchasing this controller I used a humidity/temperature controller that one would attach to a wall in your home or office. This previous controller was awful at gauging the relative humidity in the box or a small room. It required that I constantly keep checking its measured RH to that of a separate, small humidity/temperature measuring device that seems to work very well and can be checked and adjusted fairly easily. This new humidity controller is designed very smartly and its measurements of RH seem to correspond very closely with the small measuring device, unlike the previous controller I used. Also very nice is the fact that I can now have this controller OUTSIDE of the box with the soundboard and dessicant dehumidifier. It has a short cable with an AC receptacle that the dehumidifier can be plugged into, but the actual humidity measuring device is attached to the controller via a fairly long cable. I have the humidity measuring device inside the box, and the AC cord for the dessicant dehumidifier comes out of the box to be plugged into the short cable off of this humidity controller. So I can easily check the RH inside the box without having to open up the box (and thereby raise the RH level). And you can adjust the controller to automatically turn on when the RH reaches 1% to 5% above the desired RH level set on the controller. The only thing I do not like about this device is the god AWFUL english instructions! Can the people at the company in China who make this controller please hire someone who can write clear understandable english, PLEASE!! You will eventually make sense of their nearly non-sensical instructions, but it does take awhile. Just so you know, their differential RH level means how far above the target RH the actual RH will get before the device turns on. You can set this differential RH level for 1% to 5% over the target RH level.

Hygrometer might be off would have given it 5 stars otherwise but when I compared it to 4 other hygrometers it was off by at least 5% minimum in some cases higher while 3 of my hygrometers were within 3% tolerance of each other constantly sooo idk however you can calibrate it so all good

Very dependable, easy to navigate and goes what it is supposed to do A+

The high alarm cant be turned off, so if your using it to regulate humidity above 80% without a dehumidifier, the thing doesnt stop beeping. Not the best

Awesome and helpful product. I have a humidifier and dehumidifier plugged into it and they both turn on/off when my humidity gets either too high or low based on the controller settings. Easy to use and several good how to videos on youtube. I highly recommend this product.

Excellant - Works as advertised. Im using it to control my humidifier in a 10x30 room. Works Great.