Features 1、Frequency Weighting: It has three weighting modes of A/C/Z, which can be connected to a frequency analyzer or X-Y axis recorder for statistical analysis of data (Z frequency weighting is only for TA652B). 2、High Precision Microphone: High-sensitivity 1/2-inch condenser microphone, with high precision, high sensitivity, and fast transient response characteristics. 3、Data Storage: It can record and store 1999 groups data; TA652B can connect the PC through the USB to export the data records and generate charts. 4、Prompt When Over Upper/Lower Limit: The upper and lower alarm limit can be set separately. When over upper / lower limit, there will be a buzzer alarm sound, and the alarm indicator light will flash. 5、USB Connection (only TA652B): With data records download and real-time PC connection function, it can display real-time data sheet and real-time data charts. Specification Features: Frequency Weighting: It has three weighting modes of A/C/Z, which can be connected to a frequency analyzer or X-Y axis recorder for statistical analysis of data (Z frequency weighting is only for TA652B). High Precision Microphone: High-sensitivity 1/2-inch condenser microphone, with high precision, high sensitivity, and fast transient response characteristics. Data Storage: It can record and store 1999 groups data; TA652B can connect the PC through the USB to export the data records and generate charts. Prompt When Over Upper/Lower Limit: The upper and lower alarm limit can be set separately. When over upper / lower limit, there will be a buzzer alarm sound, and the alarm indicator light will flash. USB Connection (only TA652B): With data records download and real-time PC connection function, it can display real-time data sheet and real-time data charts. Specifications: Model: TA652A, TA652B (Optional) Material: ABS Range: 30~130dB Measurement Level: 30~70dB, 60~90dB, 80~110dB, 100~130dB Accuracy: ±1.5dB (sound pressure standard, 94dB@1kHz) Resolution: 0.1dB Frequency Weighting: A/C weighting (TA652A), A/C/Z weighting (TA652B) Time Weighting: FAST: 0.125s, SLOW: 1s Sampling Rate: 2 times/s Frequency Response: 31.5Hz~8kHz Analog Bar: One scale represents 1dB Display: 4 digits, max 1999 Overload: "OVER, HI" "UNDER, LO" Microphone: High precision 1/2 inch microphone Ambient Temperature: Range: 0℃~60℃ Accuracy: ±2℃ Analog Signal Output: AC/DC signal is output from the headphone jack; AC=100mVrms; 2.36Vrms/full scale per range DC=10mV/dB (TA652B) USB Connection: No (TA652A), Yes (TA652B) Data Storage: 1999 groups Synchrous Update: Refer to the PC information for program update Auto Power Off: 15 mins (can be canceled manually) Working Enviroment: -10℃~50℃, max 80%RH, indoor altitude ＜2000m Storage Enviroment: -10℃~50℃, max 70%RH (battery removed) Screen Size: 53 x 44mm Power Supply: 3 * 1.5V AA (LR06) batteries (Not included) / USB micro interface 5V Item Size: 229 * 70 * 35mm / 9.01 * 2.75 * 1.37in Item Weight: 215g / 7.58oz Package Weight: 550g / 19.40oz Package Size: 29.5 * 10 * 6cm / 11.61 * 3.94 * 2.36in Package List: 1 * Sound Level Meter 1 * USB Cable 1 * Cloth Bag 1 * User Manual (English) Package List 1 * Sound Level Meter 1 * USB Cable 1 * Cloth Bag 1 * User Manual (English)