UNI-T UT353 30~130dB Noise Measuring Instrument Audio Sound Level Meter 1. It adopts miniature capacitive microphone sensor technology and band-pass weighting network design; this microphone adopts metal hole design, and the internal double protection can still protect the sound head intact in case of accidental drop, so that you can use it with confidence 2. Can be widely used in noise engineering, quality control, health prevention and other environmental noise measurement, such as factories, traffic roads, home audio and other construction sites 3. LCD large-screen backlight display: the measurement data function symbol display, the reading is clear at a glance, high-definition, and the data can be displayed on the backlight. 4. Exquisite and compact, easy to carry. Silicone operation buttons, after friction test, not easy to fade, feel better. 5. Flip-top battery compartment design, easy to replace the battery, copper tripod fixed and durable Parameter: 1. Noise measurement range: 30 ~ 130 decibels, resolution 0.1 decibels, accuracy +-1.5 decibels 2. Frequency response: 31.5Hz-8KHz 3. Sampling rate: 125ms faster, 1s slower 4. Data Retention: Yes 5. Automatic shutdown: 5 minutes 6. Low battery indicator: 3.0-3.5V 7. Dimensions: 154 x 55mm 8. Power supply mode: 3 x 1.5V batteries (batteries not included)