Description: Automatic backlit display for easy visibility in dark situations. MAX/MIN hold feature for measuring absolute high/low peaks. Automatic power off feature after 16 minutes of no operation to save battery life. It measures range from 30~130 dB with frequency range from 31.5 to 8Khz. Highly accurate with +/-1.5dB. Perfect for monitoring noise levels in factories, offices, theaters and audio systems. Specification: Frequency Range: 31.5Hz~8KHz Response Speed: 0.5 seconds Microphone: 1/2 inches polarization capacitance microphone LCD: 3 digits and a half Resolution Ratio: 0.1dB Sound Level: A-Sound level weight Range: 30~130dB Precision: ±1.5dB ( under the reference condition of 94dB and 114dB, 1KHz) Automatic Power off: about 16 minutes Energy Provision: 1 x 9V battery (not included) Operation Temperature: 0~50 °? Operation Humidity: 10%~80%RH Storage Temperature: -10~60 °? Power Supply: 6F22 type, 9V battery Material: ABS Size: 200 x 50 x 30MM/7.9 x 2 x 1.2inch Package Includes: 1 Piece Sound meters 1 Piece Wind-proof Ball 1 Piece English Munual