Perform basic noise level surveys and calculate noise levels. Meter measures ranges from 40-130dB with an accuracy of +/- 2dB. The analog bargraph with 50dB range updates every 40 minutes. The record max/min functions track highest and lowest readings over time and the max hold function allows for the display of the highest reading. This tripod mountable unit measures 9"H X 2.2"W X 1.7"D and comes with a microphone windscreen and four AAA batteries. Order a Calibrator (#25951) to calibrate and verify sound level meter operation.