- May 13, 2001
Hey guys, so I have a Radio Shack digital SPL meter, but I don't have the instruction manual, so I'm not sure how to use it. Specifically, I don't know how to set the unit so that it measures a certain frequency. Can anyone tell me how to do this? I suspect you set the dial, and make some other adjustment. Also, the dial only goes as low as 60, so I am completely clueless as to how you'd use the unit to measure sound at 20 Hz.