Sound Level PenIts small size makes the Sound Level Pen super convenient for testing in a wide variety of sound meter applications. Auto ranging with simple one button operation. Press once to begin reading sound levels. Press the button a second time and the display holds the maximum reading, updating as new maximums are reached. Hold the button for 2 seconds to turn the unit off. Measures the 30 to 130 dB range in the "A" scale, with an accuracy of 1. 5 dB. The