Build a reusable lab report template, then print a fillable packet for each lab.
Save this lab as a named template so you can build more than one (e.g. one per lab).
Print this one template as two packets: what a class does before the lab, and what it fills in after. Choose which packet each section goes in. The whole report always prints as one, whatever you choose here.
Each column says what kind of value goes in it, and its units if it has any — both print under the column name, so a student can see the expected format before they write anything down.