Mechanically fixed inside the brake caliper bleeder, the type K thermocouple hot junction is capable of measuring the temperature at the very end of the caliper bleeder, which is close to the brake fluid. The thermocouple can be read by any thermocouple gauge like an EGT.

 

I also built a multi-channel thermocouple data logger prototype, if I 3D print a case for it, it would be ready to use in a car, contact me to pre-order and get updates on this project.

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Price is 75$ CAD  or $55usd free shipping for each sensor.