Model 407740

      Extech Model 407740 Digital Sound Level Meter measures sound in decibels (dB). Useful features include A/C Weighting, Fast/Slow Response Time, and Maximum Reading HOLD. Careful use of this meter will provide years of reliable service. It has many parts seeingfrom the outside appearance which includes Microphone, LCD Display, Calibration potentiometer(Note: Adjust pot only while using an acoustic Calibrator), Selector Switches, Maximum Hold reset button, Analog output jack. The battery compartment and tripod mount are located.
     Next , some specifications about Model 407740 are given to you for your better understanding of this product. Display is 2000 count multi-function LCD. Input Signal Range is'A'Weighting is 30dB to 130dB and 'C' Weighting is 30dB to 130dB. Response Time is that  fast response is 125ms and slow response is 1s. Resolution is 0.1 dB. Standards Compliance is ANSI and IEC Type 2. Accuracy (at 23o ± 5 o C) is ±1.5dB at 1KHz (94dB). Frequency is 31.5Hz to 8,000Hz. Microphoneis  electric condenser microphone, 0.5" (12.7mm). Range Selector Switch are 30dB to 80dB, 50 to 100dB, 80 to 130dB. Analog Output Signal are (AC) 0.5Vrms (full scale of selected range) and (DC) 0.3VDC to 1.3VDC, 10mV/dB. Analog output impedance is 600 ohms.Analog Output Terminal is 3.5mm phone jack. Operating Temperature is 32 °F to 122 °F (0 °C to 50 °C). Operating Humidity is Max. 90% RH (0° to 35°C). Power Supply is 9V battery. Dimensions are 10 x 2.8 x 1.1" (255 x 70 x 28mm). Weight is 10 oz. (280 g).
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