Review on AGPtek® Universal Temperature Controller Fahrenheit by German Diaz

What do you not like? Intuitive simple user interface. Reliable. Inexpensive (but not cheap!). Often bundled with sensors. The RNR option is for when you don't need an SSR output - instead you need to manage long term on-off loads - you should always use SSR for a short term variable, but for 10 minute cycles - RNR is fine . . Don't forget to include alarms in your design to determine if the relay will actually fail eventually - that's the price to pay for RNR's simplicity compared to SNR. Four of these devices control the fermenters in my brewery.