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QTY. 4. COLUMBIA SCIENTIFIC INDUSTRIES CSI 1600 OXIDES OF NITROGEN ANALYZERS CSI 1600 HAS BEEN DESIGNATED BY E.P.A. AS NO2 REFERENCE METHOD RFNA-0977-25 IN ACCORDANCE WITH TITLE 40 CHAPTER 1 PART 53 OF CODE OF FEDERAL REGULATIONS WHEN OPERATED ON THE 0-5 P/M RANGE WITH DAYTON MOTOR. INCLUDES OWNERS / INSTRUCTION MANUAL.