What kind of tool should I need to measure temps?
I use the aquaero 5 LT and 6 LT currently for temperature measurement of coolant and components. It also accesses all the motherboard and cpu temperatures etc in the same way as cpuid hardware monitor. You just attach a thermocouple to whatever you want to monitor.
You can control fans and pumps accordingly to a specific sensor.
Unfortunately I have no connection to the company making aquaero
This is just one way of doing it. there are other controllers/monitors, but I have no experience of them