Yes it does. Both analog and digital Radio Shack meters are fairly consistent (standard deviation is about 0.5-1.0dB) and accurate - especially when measuring the midrange. It maxes out at 125dB. It is less accurate for measuring low frequencies. Note that the 2.5db correction factor applies at approximately 40hz and provides a good overall adjustment for subs when calibrating. I strive for 72.5db so I know where reference levels are, then depending on the movie/music, adjust the sub volume up or down to taste. Its always back to reference levels when I turn off my equipment. Here is a more complete list of correction factors.
When measuring using "slow" response and "C" weighting, the following approximate corrections are close enough for our purposes:
10Hz +20.5
12.5Hz +16.5
16Hz +11.5
20Hz +7.5
25Hz +5
31.5Hz +3
40Hz +2.5
50Hz +1.5
63Hz +1.5
80Hz +1.5
100Hz +2
125Hz +0.5
160Hz -0.5
200Hz -0.5
250Hz +0.5
315Hz -0.5
400Hz 0
500Hz -0.5
630Hz 0
800Hz 0
1KHz 0
1.25Khz 0
1.6KHz -0.5
2Khz -1.5
2.5Khz -1.5
3.15Khz -1.5
4KHz -2
5KHz -2
6.3KHz -2
8KHz -2
10Khz -1
12.5KHz +0.5
16KHz 0
20KHz +1
