This document specifies the terms and definitions, requirements, test methods, inspection rules, marking, packaging, transportation and storage of ammonia nitrogen rapid analyzers. This document is applicable to the ammonia nitrogen rapid tester (hereinafter referred to as the "instrument") using Nessler's reagent and salicylic acid spectrophotometry. The measuring range of the instrument is 0.10mg/L~5.00mg/L and/or 1.00mg/L~50.00mg/ L (measured in N), can meet the determination of ammonia nitrogen in drinking water, surface water, groundwater, domestic sewage and industrial wastewater.