You can use a small drill bit, if it does not stop after about 1/2 inch, you have wood, if it stops and then goes through suddenly, you have metal.
be careful with the metal studs, and use mountings designed for metal studs, do NOT use the plastic expanding type as these will be cutoff by the metal stud.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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