PTB type approval Nor1255 & Nor1256 Revision 3 The Sound calibrators Nor1255 and Nor1256 are now recertified by PTB to the 2018 revision of the DIN EN 60942 (Equivalent to IEC 60942:2017) and the Welmec 7.2 (2015) Type P risk class A. See more Prev:Nor140 Sound Analyser for Thailand Police Back: All Posts Next:NorVirtual on Google Play & Apple Store