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Extech 407744
Sound Level Calibrator with 94 dB Output

  • Battery test position with battery status LED indicates if battery is good
  • Calibrates and verifies Sound Level Meter operation
  • For use on Sound Level Meters with 0.5" or 1.0" microphones
  • Durable die-cast, aluminum housing
  • 1 kHz sine wave at 94 dB and 114 dB (model 407766) is generated to an accuracy of 5% (frequency) and ±0.8 dB
  • Total Harmonic Distortion (THD) <2 % at 94 dB
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Extech 407744 Shown
Product Information
Datasheet 301 KB
Manual 232 KB
PDF Help
Models 407744 407766
Frequency 1000 Hz
Sound Pressure Level 94 dB 94dB or 114dB
Distortion <2% Total Harmonic Distortion (THD)
Operating Temperature 32 to 122°F (0 to 50°C)
Power Supply Two Heavy duty, alkaline 9V Battery
Power Consumption Approx. 10mA DC
Battery Test Position Yes No
LED Power Indicator No Yes
3 position switch
No Yes
Ordering Information
Model Description Buy Online Price
407744Extech 407744 94dB Sound Level Calibrator Buy Now$329.99
407744-NISTExtech 407744-NIST Sound Level Calibrator Buy Now$454.99
Additional Models Available
407766Extech 407766 94/114dB Sound Level Calibrator Buy Now$419.99
407766-NISTExtech 407766-NIST Calibrator Sound with NIST Calibration Certificate Buy Now$544.99
Included Accessories
  • (1) Carrying case
  • (1) Screwdriver
  • (2) 9V batteries

*NOTE: Items ordered with optional NIST calibration will require
approximately 10 days to complete the certification.