General Information One-Step Tetracycline Rapid Test is a competitive immunoassay for the semi-quantitative detection of the presence of Tetracycline residue in Milk,Honey,Tissue extract and Aquatic products. Detection limit: Milk 100 ppb ,Honey 20ppb , Tissue extract 100 ppb , Aquatic products 100ppb Specimen: Defatted milk, Honey, Tissue extract, Aquatic products Reading Time : 5-10min