Thermometer Panel for Jobo Systems

Problem: Jobo CPE and CPP3 processors are great for home darkrooms, but their temperature monitoring isn’t as accurate as it should be for color development. For equipment designed specifically for maintaining precise temperatures, the implementation feels outdated—these are essentially the same products manufactured for decades without the temperature control refinements modern tech could provide.

Solution: I designed a 3D-printed holder for four temperature probes that gives you more accurate temperature monitoring across your Jobo system.

The probes go in four locations: left side of the tank, right side of the tank, directly in the developer, and inside the rotating drum. Those last two are critical—if they read correctly, your development temperature is correct.

The drum probe extends 4-5cm into the tube. By pure luck, it clears the rotation mechanism without any interference.

I included label spaces on the holder because once installed, all the probe cables look identical.

Print it, mount it, and know your chemistry temperatures with confidence.

About Thermometers

Those thermometers are very generic and built under millions of brands. These are the specific ones I’ve bought, but I’m sure if you buy any of them from Amazon, you’ll get pretty much the same product.