Extech 407744 94 dB Sound Level Calibrator - 1 kHz Sine Wave for 0.5″ & 1″ Mics, ±0.5 dB Accuracy, Rugged Aluminum Housing, Battery-Test LED, IEC 60942 Certified

I need the certificationof this calibrator I really need it, it doesnt come with the product. I first buy this product to calibrate my Extech HD600 but I realized that this item doesnt come with a calibration certificate that I need to present for a project, without this its is useless.

This whole Extech system is bad. Sound monitor burns through batteries, turns off on its own, doesn’t save data.

Entrega un nivel de sonido de 95.2 dB SPL y no de 94.0 dB SPL como deberia hacerlo de acuerdo a las especificaciones

I love it! Used this baby almost everyday since i bought it and the data result is precisely as expected! Good bargain!