Wohler SP 22 Sound Level Meter

Sound Level Determination
The Wohler SP 22 Digital Sound Level Meter provides automatic or manual ranging in six measurement ranges from 30 to 130 dB. The unit meets ANSI S 1.4 and IEC 651 Type 2 standards, and features 0.1 dB resolution.
A background noise absorber permits to measure sound levels accurately even in the presence of high background noise. The meter allows you to select between fast and slow response times and A and C weighting.
A maximum hold function is provided. Jacks on the meter provide both AC and DC analog output, while a digital RS-232 interface allows you to use an optional cable to capture sound level data on a PC.

Range: 31.5 Hz ... 8 kHz
Accuracy: ± 1.5 dB
Measurement Level A filter: 30 dB...130 dB
Measurement Level C filter: 35 dB...130 dB
Measurement Level Range: 6 levels in 10 dB steps:
30...80 dB, 40...90 dB,
50...100dB, 60...110 dB,
70...120 dB, 80...130 dB
Automatic Range: 30...130 dB
Display: 3 1/ 2 digit LCD
resolution 0.1 dB
update every 0.5 sec.
Quasi Analog Bar Indicator: 1 dB display steps, 50 dB display range, updated
every 50 ms
Range: 50 dB
Time Weighting: Fast ( F) : 125 ms
Slow ( S) : 1 s
Size: 3.1" x 10.1" x 1.5"
Weight: 0.5 lb.
Current supply: 9 V block battery