1-Auto/Manual ranging from 30 to 130 dB in three 50 dB ranges. 2-Meets ANSI S1.4-1984, IEC 61672 Class 2 and EN 60651 standards. 3-A and C selectable frequency weightings. 4-Fast and Slow selectable response times. 5-Large digital display with 0.1 dB resolution. 6-Condenser microphone provides precision and stability. 7-Min/Max and Max Hold. 8-AC output for recorders. 9-Complete with batteries, Windows® 95/98/NT/2000/XP compatible software, interface cable, and case. Made In USA.