Features 1、MULTIFUNCTIONAL DESIGN: The noise sensor transmitter probe is a digital, modular multifunctional sound level meter, providing accurate and reliable noise monitoring in various contexts. 2、PROFESSIONAL TECHNOLOGY: The device adopts digital signal processing chips and digital detection technology ensures high reliability, excellent stability, and a wide dynamic range. 3、WIDE APPLICATION: Suitable for industrial noise measurement in various machines, vehicles, ships, appliances, and environmental noise, labor guard, and industrial hygienic measurements. 4、PRECISE PERFORMANCE: Ideal for use in a variety of industrial noise measurement settings, with a frequency range of 20Hz to 12.5kHz, a response time of 200ms, and a microphone size of 0.5 inches. 5、STURDY CONSTRUCTION: Made of premium aluminum alloy material, high strength, not easy to crack and damage, IP55 protective level, ensuring long lasting durability. Specifications Item Type: Noise Sensor Transmitter Probe Size: Length: approx. 292mm/11.5in Power Supply: DC 5V Output Form: RS485 (Modbus) Measurement Range: 30-130dB (A) Sensitivity: -38±3dB (or 12.6mv/Pa) Resolution: 0.1dB Accuracy: ±3dB, calibrated at 23±5℃ ambient temperature, frequency weighting complies with IEC 61672 type 2 standard, calibrated under the condition of input signal at 94dB (1kHz). Frequency Range: 20Hz to 12.5kHz Response Time: 200ms, time response simulates human ear response Calibrator: for BK (for Bruel for Kjaer company), multifunctional sound calibrator, model 4231 Microphone: Electret microphone Directivity: Omnidirectional Microphone Size: 0.5 inch Load Capacity: Impedance ≤350Ω for current output when powered by DC12V, ≤900Ω for current output when powered by DC24V, impedance ≥1KΩ for voltage output Maximum Power Consumption: 500mW Material: Aluminum alloy Operating Environment: Temperature -40℃ to 80℃, humidity ≤100%RH non-condensing Protective Grade: IP55 Troubleshooting: The meter display value is incorrect during output. It may be due to wiring issues or communicating port failure. Please check if the wiring is correct and secure, if the port is occupied, and if the port settings are correct. Wire Order Wire Color Output Signal RS485 Red Power Positive Black A+/TX Yellow B-/RX Green Power Negative Weight: Approx. 418.00g / 14.74oz Package List 1 x Noise Sensor 1 x Cable 1 x User Manual