9027-10-0000 (Gas or smoke analysis apparatus),

9027-30-4000 (spectrometers),

9027-50-3000 (colorimeters), 

9027-90-9099 (other)

Enforcement Regulations of the Environmental Testing and Inspection Act

The Regulations require performance certification on select monitoring or measuring instruments that are not subject to type approval or preliminary type approval under the Environmental Testing and Inspection Act (hereinafter referred to as "simple measuring instruments"). Under the Act, no person shall manufacture or import simple measuring instruments without the performance certification, and the Regulations prescribe a two-level certification system (Grade 1 and Certified) for these instruments. 

Specifically, the Regulations prescribe the list of simple measuring instruments, the process and required documents for applying performance certification, and the threshold for performance certification by medium (air, water, noise, etc.).