Model 407732

      The extech 407732 digital sound level meter measures and displays sound pressure levels in dB from 35 dB to 130dB. The LCD is backlit for viewing readings in dimly lit areas. User selectable features include Frequency Weighting ('A' and 'C'), Response Time (Fast and Slow), Max Hold, and Range (High and Low). Careful use of this meter will provide years of reliable service.
     407732 has many parts seeing from outside including microphone, 4-digit LCD display, ON-OFF button, LCD backlight button, frenquency weighting selection button, response time selection button, range selector button, max hold / daa hold selector button , battery compartment on rear , calibration pots in battery compartment, windscreen.
    There are some specifications about 407732. Display is 4-digit (4000 count) backlit LCD. Display update rate is 0.5 seconds. Microphone is 0.5" Electret condensor. Measurement bandwidth is 31.5 HZ to 8 KHz. Dynamic range is 65 dB.Measurement range is 35 dB to 130 dB (low:35 to 100; high:65 to 130)). Frenquency weighting is 'A' and 'C' (selectable). Accurancy is ± 1.5dB (under reference conditions). Resolution is 0.1 dB. Maximum hold decay time is less than 1 dB per 3 min. Power is 9V battery. Battery life is 50 hours(typical)(low battery indicator alerts user).Automatic power off is after approx.15 minutes of inactivity. Operating temperature is 32^oF to 104^oF (0^oC to 40^oC). Operating humidity is 10 to 90% RH. Storage humidity is 14^oF to 140^oF (-10^oC to 60^oC). Dimensions are 9.45 x 2.68 x 1" (240 x 68 x 25mm). Weight is 6.75oz (210g).
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