SMART SENSOR AS834+ AS844+ Digital LCD Sound Level Meter Noisemeter 30-130dB  Noise Volume Decibel Monitoring Tester Instrument SMART SENSOR Model:AS834+ Features: 1. 2.7" large LCD colour display for easy reading, convenient to use. 2. Wide measurement range from 30dB to 130dB, 35-130dBC,Frequency: 31.5Hz - 8KHz, 3. Resolution: 0.1dB, Accuracy: ±1.5dB. 4. A and C equivalent weighted sound pressure levels. 5. Fast and slow dynamic characteristic mode. 6. AC and DC signal output for frequency analyzer level recorder, FFT analyzer, graphic recorder, etc. 7. Maximum/minimum value measurement. 8. 90-130dB alarm level setup range, it will hold the maximum value once the measured level is large than the alarm setup level. 9. Low battery indication, automatic & manual power off function. 10. Equipped with sponge ball and a storage pouch. Compact and light, convenient to hold and carry. 11. Portable and easy to use, suitable for checking, monitoring or controlling the sound level for personal, families, business, studies, industrial, etc. Specifications& 65306;       Brand name     Smart Sensor         Color     Yellow         Model number     AS834+     Accuracy    ±1.5dB         Frequency range     31.5Hz-8.5KHz     Dynamic range     50dB         Measure range     30-130dBA,35-130dBC     Frequency weighting     A and C weighting         Digital display     4 digit     Resolution     0.1dB         Sampling speed     2 times/second     Analog Bar Graph     One bar is 1 dB         AC signal output     0.707V rms at FS     DC signal output     10mV/dB         Time weighting     Fast/Slow     Power supply     9V battery(not included)         Operation temperature     0°C-40°C(10%-80%RH)     Storage temperature     -10°C-60°C(10%-70%RH)     SMART SENSOR Model:AS844+ Features:  1. Data storage function allows to store up to 15,000 groups of data.Connect with the computer through USB cable, which supports data record           download, real-time sampling analysis, and graph & data printing.  2. Real time display the current temperature(& 8451;/& 8457; switchable) and humidity.  3. 2.7" large LCD display for easy reading, convenient to use.  4. Wide measurement range from 30dB to 130dB, Frequency: 31.5Hz - 8KHz, 5. Resolution: 0.1dB, Accuracy: ±1.5dB.  5. With A and C equivalent weighted sound pressure levels.  6.