Michael, you want to set it to C weighting and slow response.

With the circular dial, select the appropriate range (70, 80, etc.). If, for example you select the "80" range, when the needle points at "0", the signal is 80dB. If the needle points to the "2" to the left of the zero, you're getting 80dB MINUS 2 dB, or 78dB.

Set it to the "70" range, and "0" represents 70dB.

Jack

"People generally quarrel because they cannot argue." - G. K. Chesterton