How to create a table that fits over the page and has text centered?

I’m trying to recreate the following table. I’ve only worked with booktabs before so I don’t know how to create this kind of table.

This is what I tried:

documentclass[12pt]{article}

begin{table}[h]
centering
begin{tabular}{|c|c|c|}
hline
Controlled Variable & Description & Value  hline
                    &             &        hline
                    &             &        hline
                    &             &        hline
end{tabular}
}
end{table}

I’d appreciate any suggestions.