Minimum Rotor Thickness for 2007 Impala?

I'm changing Brake Pads on my 2007 Impala LT. I have 4-wheel disk brakes. I'm trying to decide if I should also change the Rotors. Any Minimum Thickness specification that may have been stamped on the Rotor is rusted-over, and illegible.

Can someone please let me know what the minimum thickness (discard point) of the Front and Rear rotors are?

Thanks in advance.

Any good auto parts store that offers rotor machining will have the specs and the calipers necessary to get a minimum thickness reading. Or ask the manager of a brake repair shop for the specs. If the rotors are badly grooved, replace them anyway to be on the safe side. Rotors should be replaced in pairs.

I own a pair of calipers, but don't know the spec.
There aren't any decent shops around me any more. They started disappearing about 10 years ago. So now my only option is replacement through Rockauto.

But I still don't know if I need to order the Rotors or not, hence my request. :)