Precision Sound Level Calibrator

1" Microphones - IEC 60942 Class 1 | Model CAL250

CAL250 precision acoustic sound level calibrator for microphonesIEC 60942 Class 1 Handheld Sound Level Calibrator for 1" microphones at 251.2 Hz Used for Sound Level Meters and Other Sound Measuring Equipment

The Larson Davis Model CAL250 is a battery operated precision microphone calibrator used for the calibration of sound level meters and other sound measurement equipment. The CAL250 delivers a full 114.0 dB level output signal @ 251.2 Hz.

It has been designed for field or laboratory use and its accuracy has been calibrated to a reference traceable to the National Institute of Standards and Technology (NIST).

The Larson Davis CAL250 features a stable sound pressure independent of the battery condition. In addition, the CAL250 will turn off automatically to preserve battery and guarantee a stable output.


  •   Output level: 114 dB
  •   Output frequency: 251.2 Hz
  •   Standard: 1" microphone
  •   ANSI S1.40, IEC 60942-2017 Class 1 compliant
  •   Internal battery
  •   Output level independent of battery condition
  •   Adapters: 1/2", 1/4", 3/8" & 1/8" microphones
  •   Array adaptor for 8 microphones simultaneously


  •   Field calibration or laboratory


  •   Sound level meters
  •   Noise dosimeters
  •   Noise monitoring stations
  •   Microphone arrays