ound Level Meter, Analog Meets decibel frequency weighting A (dbA) ANSI specifications. Measure the typical noises of the classroom, from normal speech to nearly unbearable hallway traffic, with this versatile meter. Our dial switch detects sound on two separate ranges (35 - 80 dB and 75 - 120 dB). Signal oscillator calibration is manually adjustable. Includes: carry case and instructions. 16 x 6.5 x 4 cm in size. Qty :