NOTE: ER•200 and ER•200D Personal Noise Dosimeters were not designed to be Type 2 devices, although they meet some of the criteria for Type 2 devices (e.g., linearity, microphone response and frequency response). Information regarding ANSI requirements for Type 2 noise dosimeters can be found in ANSI S1.25-1991(R2002), Specifications for Personal Noise Dosimeters.