I made some more PID temperature projects. All parts were purchased on Amazon except the PT100 RTD temperature sensors which came from auberins.com. A lot of fun to build, and they perform very well.

The small chassis controller is for an incubator. The one where the PID controller is separate and connected with low voltage wire is what I use on my ARS rack system. The controller with the square PID controller installed in the front is for a glass tank using a deep heat projector for heat.