The Norsonic Nor1256 Electronic Multi-Level Acoustic Calibrator is a small, battery-operated Class 1 Microphone Calibrator conforming to IEC 60942 and ANSI S1.40. The Nor1256 generates both 114dB and 94 dB, at 1kHz and 250Hz. The combination of two different levels and two different frequencies allow both level and frequency linearity to be verified. In addition, the sound calibrator measures environmental conditions including air pressure, temperature, and humidity. Each calibrator is supplied with an individual accredited calibration certificate.