Class 1 and Class 2
In the British and international standards for sound level meters, the accuracy and performance of an instrument is defined by its type. The classification runs from Class 0 to Class 2 with 0 being the most accurate and demanding for laboratory environments and Class 2 being the least. Classes 1 and 2 are most applicable for user applications with Class 1 being the 'gold standard' for professionals in the field.
 
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