How to Calibrate Noise level meter, pls read it below :Calibration ProceduresPlease use a Standard Acoustic Calibrator.1.Make the following settings:Display:SPL(dBA) Time2.Insert the microphone carefully into the 1/2 inch hole of the Calibrator.3.Turn on the Calibrator and adjust the Protentiometer in side the Battery compartment level of the unit (shown in the diagram 1).The level display will indicate the desired Level (94.0).Our products are all well calibrated before Shipment.Recommen
