Nor1255 Sound Calibrator

The Nor1255 is a precision Class 1 sound calibrator providing accurate reference levels for field verification and calibration of sound level meters and measurement microphones. Compliant with IEC 60942:2017 Class 1 requirements, with type approvals from PTB (Germany), LNE (France), and BEV (Austria), the Nor1255 delivers a certified 114.0 dB ± 0.2 dB output at 1000 Hz for traceable field calibration checks before and after every noise measurement session. Field calibration is a mandatory requirement in virtually all acoustic measurement standards including IEC 61672, ISO 1996, ISO 16283, and ISO 9612. The Nor1255 ensures that your sound level meter is reading accurately at the point of measurement, providing documentary evidence of calibration for regulatory submissions and legal proceedings. The dual 94 dB and 114 dB output levels allow verification at both normal measurement levels and higher levels to confirm instrument linearity. Designed for 1-inch and 1/2-inch measurement microphones, the Nor1255 accommodates the microphone types used on professional sound level meters from Norsonic and other manufacturers. Battery operation from two AAA cells provides over 10 hours of use, while the compact 125 g form factor fits easily into any field measurement kit. For acoustics professionals across the GCC working on environmental noise monitoring, building acoustics testing, and occupational noise assessment, the Nor1255 is an essential companion to ensure measurement accuracy and regulatory compliance.