AR824 sound level meter has 1/2 inch condenser microphone,
30~130 dBA / 35~130 dBC measuring range, accuracy ±1.5dB,
frequency weighting A & C, frequency range 31.5Hz ~ 8.5KHz, sampling rate 2 times / sec, level range bar graph, 4 modes range selection, range over indication, battery indication, digit and resolution 5 digits and 0.1 dB, time weighting fast / slow,
backlight display, max hold function, auto power off, AC and DC signal output, 4*1.5V AAA battery, net weight 300g, size 265 x 72 x 35 mm.