Feature: 1. Can be widely used for household and industrial use, living room noise measurement and company noise, on-site noise etc. 2. With LCD display screen, clear readings and easy to use at night. 3. It is lightweight, compact, ergonomic, user-friendly and great for monitoring noise levels. 4. With maximum/minimum hold, screen lock hold, low battery indication function. 5. It will automatically shut down after 30 minutes when not in use to extend battery life. Specification: Condition: 100% Brand New Item Type: Sound Level Meter Material: ABS Color: As shown in the picture Applicable standard IEC61672-1 category 2 Accuracy ±1.4 dB Frequency range 31.5Hz~8KHz Dynamic range 50 dB Measurement level range 30dB〜130dB Frequency weighting dB Microphone 1/2in electret capacitor Display 3 1/2 digits Resolution 0.1 dB Data update 0.5 seconds Maximum hold Maximum value Minimum hold Minimum Screen lock Hold Auto Power Off The meter automatically turns off after about 30 minutes. Inactive for 15 minutes. Power supply 1 x 9V battery, 006P or IEC 6F22 or NEDA 1604 (not included) Battery life At least 30 hours Operating conditions -20℃〜60℃,10％RH〜90％RH Storage conditions -20℃〜60℃,10％RH〜75％RH Size(L x W x H) 144x55x38mm / 5.7x2.2x1.5in Weight 90g/3.2oz . Package List: 1 x Sound Level Meter1 x English Manual Note: 1. Please allow 1-2cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.