Anything will work provided that it makes it safe for you to work under a suspended load without it being able to kill you. Not sure what one of those is. You can buy an infra red temp gun for around $20 at most major hardware stores, like this one - https://www.google.com/search?q=inf...5vUHE5THM2QWtfNxgBMAE4ASCor9HyC0oIEAIYASABKAE