1. Accuracy: class 1 2. Air Pressure compensation: automatic compensation 3. Sound pressure level: 114.0dB and 94.0dB 4. Frequency: 1000Hz 5. Settling time: less than 15s 6. Operating voltage range: 2.2V~3.4V 7. Battery: 2 x 1.5V AA batteries (not included) 8. Complies with authoritative standards GB/T 15173-2010 and IEC 60942:2017, providing accurate sound pressure sensitivity calibration for testing microphones and acoustic measuring instruments. 9. Switch sound pressure levels with the toggle button for faster and more convenient calibration. 10. Dimensions: 72x72x42mm 11. Weight: 96g
