Model 407750

      Extech 407750 measures sound level in dB and the measurement range can be set automatically or manually. The 407750 offers selectable frequency weighting ('A' and 'C') and Time Response (Fast and Slow). The built-in RS-232 PC interface allows the user to record readings onto a PC in real-time. Careful use of this meter will provide years of reliable service.
    There are some specifications about 407750 . Display is backlit 2000 count LCD with analog bargraph. Display update rate is (Main LCD digits) 0.5 seconds and (Bargraph) 50mS. Analog bargraph  is 1dB steps with 50dB display range. Microphone is electret condensor (0.5" diameter). Measurement Bandwidth is 31.5Hz to 8KHz. Accuracy / Resolution is ± 1.5dB / 0.1dB. Time response selections are fast (125ms) and slow (1 second).Standards Meets ANSI and IEC Type 2.External Calibrator is extech models 407766 or 407744. Dimensions is 3.2 x 10.1 x 1.5" (80 x 256 x 38mm) . weight is 8.5 oz. (240g).
      407750  has many parts seeing from the outside appearance which include LCD Display, Microphone, ON/OFF key, REC (Record) key, MAXHLD (Max Hold) key, C/A Weighting Select key, BA (Background Absorber) key, F/S Fast / Slow Response select key, DOWN, Backlit (LCD backlighting) key, UPPER, AC adaptor jack, Calibration screw adjust, AC analog output jack, DC analog output jack, RS-232 output jack.
      Extech offers repair and calibration services for the products we sell. Extech also provides NIST certification for most products. Call the Customer Service Department for information on calibration services available for this product. Extech recommends that annual calibrations be performed to verify meter performance and accuracy.All in all , this is just a short and simple introdution about 407750 , if you find great interest in it , please give your attention to our web and you will find more detailed information here ! Thanks for your concern !