UNI-T UT353BT Mini Sound Level Meter Digital Bluetooth Noise Meter Tester BR2403 This meter is featured with wide measuring range (30-130dB), which could connect your phone by Bluetooth. It can be widely used for monitoring sound level in homes, office, schools, factories, construction site, etc.    Features:  Built-in Bluetooth system, can export the data by Bluetooth.  LCD display with backlight, easy for reading.  Wide measurement range from 30dB to 130dB.  Measuring unit is switchable: Fast or Slow.  Includes data storage and data transmission function.  With maximum and minimum value measurement.  Equipped with sponge ball.  Low battery indication, automatic & manual power off function.  Compact and light, convenient to hold and carry.  Specifications:  Brand Name: UNI-T  Color: Red  Material: ABS Plastic  Display: LCD Display  Measuring Range: 30?130dB  Accuracy: ±1.5dB  Resolution: 0.1dB  Frequency Response: 31.5Hz to 8KHz  Sampling Rate: 125ms(fast mode) / 1s(slow mode)  Operating Temperature: 23°C±5°C(<=80%RH)  Storage Temperature: -20?60°C(<=80%RH)  Overload Indication: OL  Auto Power Off: 5min  Altitude: Max.2000m  Power Supply: 3 * 1.5V AAA Batteries(Included)  Operation System: Andriod 4.3, ios 8.4, Bluetooth 4.0 or more  Item Size: Approx. 15 * 5.1 * 2.7cm / 5.9 * 2 * 1.1in  Item Weight: Approx. 80g / 2.8oz Features: Compact and portable design for easy handling. Digital display for clear and precise readings. Bluetooth connectivity for data transfer. Wide measurement range for different environments. Fast response for real-time noise monitoring. Specifications: Brand: UNI-T. Model: UT353BT. Measurement Range: Typically 30–130 dB (model dependent). Accuracy: ±1.5 dB (standard). Power Supply: Battery-operated for portability. Uses: Monitoring workplace noise levels for safety compliance. Measuring environmental sound in residential or commercial areas. Industrial noise assessment in factories and plants. Checking sound levels for equipment and machinery. Package includes: 1x UNI T UT353BT Mini Sound Level Meter Digital Bluetooth Noise Meter Tester