Feature: 1. DECIBEL METER WITH A WEIGHTING: WT85 decibel meter use an accurate condenser microphone to catch sound. Equipped with A weighting facilities that measure noise levels from 30 to 130dB with an accuracy of ±1.5dB, frequency from 31.5Hz‑8KHz 2. APPLICABLE SCENARIO: Decibel meter is perfect for monitoring noise levels in communities, home theaters, audio systems, automobiles, workshops, schools, offices, factories 3. 2.25IN LCD SCREEN WITH BACKLIGHT: This sound level meter is measured noise levels are expressed in decibels(dB) and displayed on the 2.25in LCD screen, easy to read on a big display design. Long press the backlight button to turn on a backlight, making it easy to view even in damn light 4. MAXIMUM AND MIN MEASUREMENT, DATE HOLD: The sound pressure level(SPL) meter has Maximum or Min measurement values to represent the maximum or minimum(high or low peak) value of the sound produced within a certain time, and the data hold function can freeze the current reading based on the sound measurement according to individual needs 5. EASY TO USE AND FEATURE PACKED: The non slip side design ensure that the portable noise meter fit easily in the hand. And SPL meter is a battery operated noise meter Specification: Item Type: Sound Level Meter Material: ABS Battery Type: 3 x AAA battery(not included) Measurement Range: 30-130dBA Accuracy: ±1.5dB Frequency Response: 31.5Hz-8KHz Frequency Weighting: A Weighting Resolution: 0.1dB Operating Temperature And Humidity: 0-40℃, 10-80% RH Storage Temperature And Humidity: -10-60℃, 0-90% RH. Package List: 1 x Main Unit 1 x Windproof Ball 1 x User Manual