PACER Industries Sound Level Meter Basic, affordable and dependable, the SL-120 Sound Level Meter features a 40-120 dB(A) range, one button operation, and a 2.7 volt battery with a miniumum life of 100 hours. Measures only 5-3/4" x 1-3/4" x 1" and weighs 3-1/2 ounces. Meets ANSI SI.4 1983 Type 2 Standard.