SL824 Digital Sound Level Meter, Sound Meter, Sound Noise Meter

Specifications: 7 Sound Levels: 30 ~ 130 dB selectable using the Level Selecting Button switch*************level 1: 30 ~ 80dB*************level 2: 40 ~ 90dB*************level 3: 50 ~ 100dB*************level 4: 60 ~ 110dB*************level 5: 70 ~ 120dB*************level 6: 80 ~ 130dB*************level 7: 30 ~ 130dB Accuracy: ± 1.5 dB Frequency Range: 31.5 Hz to 8.5k Kz Linearity Range: 50dB Measuring Level: 30~130dBA, 35~130dBC Frequency Weighting: A, C Digital Display: 4 digits Resolution: 0.1dB Display: 0.5 secretary Bar Graph: 50dB scale at 1dB step for monitoring current sound pressure level display period of 50mS Level Ranges: 30~80dB, 40~90dB, 50~100dB, 60~110dB, 70~120dB, 80~130dB, 30~130dB Over indicate over range: Under indicate less than lower limit of the range AC output: 0.707 Vrms at FS output impedance approx 600 Ω DC output: 10 mV / dB output impedance approx 100 Ω Time weighting: Fast / Slow Microphone: ½ Inch electret condenser microphone Max: Maximum hold Power Supply: 6F22 9V alkaline cells (30 hrs life span) or DC 9V 100mA