Johnson ControlsA421ABG-02C A421 Series Electronic Temperature Control with Pre Wired Power Cord, -40 to 212 Degree F Temperature Range,Silver

Perfect for energizing the heat-wrap on beer fermenter. Well made, solid, reliable, worry free. Instructions were a bit of a challa but after using the control a bit, became clearer to understand then made better sense.I would certainly buy this again.

Fast delivery, and this controller does everything but the dishes after dinner. Not necessarily intuitive to program, but with a little patience while reading the instructions, it is not rocket surgery. Nice features include an automatic start delay (in case you use it to control a refrigeration compressor), advanced programming access that is NOT intuitive (to keep little hands from screwing up what you programmed), and a restricted programming jumper (takes some disassembly to change) as double insurance against the uninformed changing the controller program. LOVE IT!

I use the Johnson control to convert a small chest freezer to outdoor refrigerator in my outdoor kitchen. Easy to adjust temperature. Able Dial in perfect temperature to have slushy beer when opening.

The unit works flawlessly. Converted my Arctic King chest freezer into a Chest refrigerator at a constant 36 degrees. Success was by Trial & Error over. Several Days. I NEVER Figured out the insructions worded and written by an Electrical Engineer with an advanced degree. DEFINATELY BUY this unit. FLAWLESS Operation.

I'm on my third one of these controllers for my chest fridge, which will tell you something. However each replacement I order has been upgraded and improved and lasts longer than the previous one. This one has a great digital display. The coil is a nice thick rubber? or plastic? of some sort. Sturdy.Very easy to use, even with no knowledge of electronics. Keeps my chest fridge temperature accurately within my chosen range.The simplicity, affordability, and extremely low energy use of the whole system (temperature regulator plus chest freezer) even convinced my husband that our next fridge will also be a chest fridge.

I am using this to convert my chest freezer into a kegerator and it works awesome. It keeps the temp within 2 degrees of what I have it set to. I have not had any issues with it thus far. It is a little more expensive than other control units, but it is definitely worth the money.

Works well , I converted a large freezer to age venison. This switch did the trick.

This is exactly what I needed to set up my chest freezer-kegerator. I accidentally threw out the instructions when I was cleaning up all the boxes for the keg system, but quickly found an instructional video online to help with setup. I didn’t bother going into the advanced options, just low temp, high temp, and cycle delay.Its worth the extra money for plug-n-play!