Please read the following- This kit comes with 1 sensor of your choice- SPL sensor (to 185db), AC Clamp Power sensor(to 300v, 400a) or RTA (Full FR to 155db) Description The LCD BASS METER SE portable noise meter is intended for measuring noise level and sound pressure at the low frequency. The source of the measured signal can be provided by both industrial equipment and acoustic systems. The main advantage of this noise meter is complete autonomy of work. For carrying out measurements you won`t need a computer; all data is processed and calculated in the device and depicted on its display. If it is necessary to receive more detailed information, such as spectrum or signal waveform, the device can be connected to a PC using USB port. The NEXT-LAB SPL Pressure Sensor, which is included in the equipment distribution kit, allows receiving results with high accuracy of 0.1 dB. The device has Lab-Bus digital bus port, to which the pressure sensor, microphone or power sensor can be connected. When users in the beginning purchase a set for measuring sound pressure, in future they can supplement it with the microphone for measuring AFC or with the power sensor for measuring current and voltage. Functions Displaying the peak values and average level of sound pressure, as well as harmonic distortion coefficient. Measuring the sound pressure using Next-Lab SPL Sensor. Measuring AFC and performing a spectral analysis of the signal using Next-Lab RTA Microphone (should be purchased separately) Measuring the current-voltage characteristics of direct and alternating current circuits using Next-Lab Power Sensor (should be purchased separately) Possibility of controlling the device and transmitting data to the PC via USB port Measuring the characteristics of home, car or concert hall acoustic systems and setting them up Measuring the characteristics of home, car or industrial power supply networks and setting them up.