BESANTEK BST-SL2 Sound Level Meters cover a wide range of applications and performance criteria including noise pollution studies for the quantification of almost any noise,but especially for industrial, environmental, and aircraft noise. • Max. & Min. function. • Over & Under range indication. • 4-digit LCD display with bar graph. • Frequency weighting characteristic for 2 times per second. • AC signal output. • Low battery indication. • IEC 651 Type 2 & ANIS S1.4 Type 2.