Sound Level Meter Kit (#6767)
Price: $16.99
Datasheet:
Single-channel Sound Level Meter kit with adjustable input gain and adjustable LM3914 range.
Kit can run off of 9 to 12 volts. Kit will include the PCB and all components and schematic to complete the kit. 9 volt battery clip is included.
The PCB is 2.5" around with one mounting hole.