Review on 🌡 WH8040 1%~99% RH HM-40 Type Digital Air Humidity Control Controller 110V by Joel Young

My Rating: This humidistat works well for me. I track them with the La Crosse monitoring system, which saves humidity readings to the remote readout app every 15 minutes, so I know the humidity is being kept at a good level even when I'm away. The reading appears to be within +-3% of the actual value and since the reading can be adjusted to +-5% this is ideal. Changing the settings is also very easy, just press and hold the "Set” button for 3-4 seconds and you will enter the settings menu. From there all the settings are explained very well in the manual but if you want an example I'll add my settings at the end of this review. It can be set to humidify or dehumidify, and you can set upper and lower limits for the humidity level you want. The only thing I would change about this product is that the relay clicks a little louder than some of the other controllers I've used; it's about finger-snapping loudness, but since this unit isn't in my bedroom, the noise doesn't bother me. The only tricky part of the setup was figuring out the best connection method, but with the attached diagram it should be easy. To be honest I think building your own power supply is great as it allows you to decide how long to use the cable. Technical information: The attached picture shows how I connected the power supply. This allows me to plug the humidifier directly into the end of the extension cord. Credit for this idea goes to Derek A., another customer who wrote a review; The only reason I am attaching another schematic is that it was missing how to connect power to the controller itself. I connected the power supply to the controller in parallel with the relay to use only one power supply while still allowing the relay to control the humidifier/dehumidifier power supply. Supplies needed: Electrical tape 14 gauge wire Wire strippers (1) Swivel wire connectors (4) Extension cords (1) variable RF to display actual moisture readings. For HC = H: Turn on when HR < HS - D Turn off when HR > HS. For HC = C: turn on when HR > LS + D turn on when off when HR < LS My usage: That's all you need to know, feel free to read on, but if you want an example... The extension cord The connection I used is a cord rated 125V 15A (standard material) and can be found at almost any store. While I think this product would work well for any humidity control application, I use this product with a reptile humidifier to control humidity in my ball python's terrarium. From what I've read ball pythons like 55-65% humidity, so my settings are: HC=HD=5HS=65 (this value only seems to matter if a humidifier is present, ie HC=H) LS = 55 (this value only matters if there is a dryer, so HC = C, but I set it anyway) All other settings I left unchanged. With this product I also use the "La Crosse Alerts Mobile 926-25101-GP Dry Sensor Wireless Monitoring System" along with the "Wemo Mini Smart Plug" as a backup. The monitoring system sends me text and/or email alerts when the humidity exceeds a certain level, and I can remotely turn off the humidifier with a smart plug if the controller fails. This protects my ball python from scale rot. I use a similar setting for my temperature controller to keep my Python from overheating. I highly recommend it if you want to protect your pet; Remember that all electronics will fail sooner or later, be it a week, a month or 15 years. This is my honest review and I have not received any compensation for my opinion.