Other ways to say 'more precisely' and 'more exactly'

I am writing an academic report, and I often need to provide more information about my previous sayings. I usually use the phrases ‘more precisely’ and ‘more exactly’ to do so. But you know, after some time, my text becomes really boring. I wonder if there are other scientific expressions to say ‘more precisely’ and ‘more exactly.’

e.g., We use a refrigerator with the temperature set to -7C to freeze the solution. More precisely, we need to pour the solution into a special container to let its temperature become equal to our room’s temperature before putting it into the refrigerator.