Need help for measuring the temperature of a heatsink

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Joined Dec 5, 2019
I am doing a project in which I am using a current sense resistor for which I need to implement a heat sink like WMHPHS-25A, but I need to somehow measure the temperature of that heatsink and component (a requirement made by a teacher even though I don't think it's needed). I tried with an LM335 and a Ring terminal to mount them to the heatsink hole but the heat transfer of the ring is too low. Can you recommend a method that might work in my application and is not very expensive, because I ran out of ideas?