Reddit reviews Gain Express Professional Decibel Meter Sound Level Meter with Backlight Display High Accuracy SPL Meter dB Meter Measuring 30dB-130dB (Without Data Record Function)
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Auto Range with Frequency response: 31.5~8.5KHzMeasurement range: 30~130dBA and A/C weightingCalibration sound source: 94dB @ 1kHzCE Certified & RoHS Compliant
If you want to ballpark it: Buy a decibel meter and place it right at the driver when the Headphone is playing.
If you want to have an absolutely accurate measurement you need a Head and Torso Simulator with anatomically correct ears, they are kinda expensive though.