Digital Sound Noise Level Meter Decibel Pressure Logger Features: *Two equivalent weighted sound pressure levels, A and C *Max locked function has the maximum value, after the stent-in-one unique, easy to use *Auto power off function *Low battery indicator *Overload prompts *Portable, easy to use and handy *Instantaneous sound measure function *Tripod Mounting option Specification: *Sound Level: 40 ~ 130 dB With Level Selecting Button Switches *level 1: 40 ~ 70dB *level 2: 60 ~ 90dB *level 3: 80 ~ 110dB *level 4: 100 ~ 130dB *level 5: 40 ~ 130dB *Accuracy: ?2dB (under reference condition) *Measuring Level: 40~130dBA, 40~130dBC *Frequency Range: 31.5 Hz ~ 8.5 kHz *Linearity/Dynamic Range: 30dB *Frequency weighting: A and C features *Digital LCD: 45 x 35mm with 4 digits, Resolution: 0.1dB, Display: 0.5 secretary *Sampling Rate: 2 times/second *Dynamic Characteristic (Time weighting): FAST (high speed) / SLOW (low speed) *1 bar graph represents 1dB in the Analog Bar Graph *Bar Graph: 50dB scale at 1dB step for monitoring current sound pressure level display period of 50mS *Level Ranges: 40 ~ 70dB, 60 ~ 90dB, 80 ~ 110dB, 100 ~ 130dB, 40 ~ 130dB *Load indication: Use the symbol OVER (indicating over range) and UNDER (indicating less than lower limit of the range) *AC output: 0.707 Vrms at FS output impedance approx. 600? *Microphone: 1/2 inch electret condenser microphone *Maximum Hold *Power Supply: 6F22 9V alkaline cells/battery or DC 9V 100mA Package Contents: 1 x Sound Level Meter 1 x Sponge Ball