The N241 is a reference microphone that uses 1/2" all-metal capsule. It is carefully engineered to give long term reliability and accuracy. The N241 has a linear frequency response up to 40k Hz which is achieved by a superior acoustical and mechanical design. The N241 can handle the extreme sound level up to 140 dB. You can close-mike drums, percussion and brass or other powerful sound sources with total accuracy for a clean, undistorted dynamic sound. The N241 is designed according to IEC 61094 standard dimensions. It can be calibrated by using the BSWA CA 114 Sound Level Calibrator.