N.Y. Comp. Codes R. & Regs. tit. 6, § 451.2 – Type of measurement systems which may be used.

(a) A Type 1 sound level meter;
(b) A Type 2 sound level meter; or
(c) A Type S sound level meter which has
1. (1) A-weighting frequency response;
2. (2) Fast dynamic characteristics of its indicating instrument; and
3. (3) A relative response level tolerance consistent with those of either a Type 1 or Type 2 sound level meter, as specified in section 3.2 of ANSI S1.4-1971.

The sound level measurement system must meet or exceed the requirements of American National Standards Specification for Sound Level Meters, ANSI S1.4-1971, approved April 27, 1971, issued by the American National Standards Institute¹, throughout the applicable frequency range for either: