1. This unit was designed according to following standards: -International electrician committee standard: IEC PUB 651 TYPE2 -US national standard: ANSI S1.4 TYPE2 2. Accuracy up to +/-1.5dB 3. Measurement range is 30 to 130dB 4. Fast/slow time weighting selection 5. Automatic backlight 6. The maximum value holding function 7. Auto power off 10 minutes 8. A/C Frequency weighting selection 9. Both AC and PWM signal output are available 10. Calendar function 11. 4700 data record function 12. Connect with PC through USB,provides data record downloading,real-time data sampling analysis,and printing graph & data functions. 13. Power: 4xAA batteries(not included)
