In the following sentence,
"Signal strength was 20, 30, 40 dB at floors 1,2,3 respectively."
Should I use was or were?
Should the unit dB be used just for the last input of the list or every input?
Should I use floors or floor?
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"Signal strength was at 20db, 30db, 40db for their respective floors 1, 2 and 3."
Works in a general sense. If you were writing a technical paper/manual I would advise relating each floor to its db level.
"Single strength on floor 1 was 20db, floor 2 was 30db, and floor 3 was 40db."
This sacrifices brevity for clarity for the reader.