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A dye couple compound is provided for use in a test device containing a reagent system for detecting the presence or quantity of an analyte in a sample. The reagent system comprises one or more enzymes which, in the presence of the analyte, produce an oxidizing agent in quantities indicative of the

A dye couple compound is provided for use in a test device containing a reagent system for detecting the presence or quantity of an analyte in a sample. The reagent system comprises one or more enzymes which, in the presence of the analyte, produce an oxidizing agent in quantities indicative of the quantity of analyte in the sample. The compound of choice is meta[3-methyl 2-benzothiazolinone hydrozone]N-sulfonyl benzenesulfonate monosodium.

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[ What is claimed is:] [1.] In a test device containing a reagent system for determining the presence or quantity of an analyte in a sample wherein said reagent system comprises enzymes to produce an oxidizing agent in quantities indicative of quantities of said analyte in said sample; the improveme

[ What is claimed is:] [1.] In a test device containing a reagent system for determining the presence or quantity of an analyte in a sample wherein said reagent system comprises enzymes to produce an oxidizing agent in quantities indicative of quantities of said analyte in said sample; the improvement wherein:said reagent system comprises a dye couple forming a chromophore upon being oxidized by said oxidizing agent, said dye couple comprising a compound having the formula: [ STR 7 ] wherein R is selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heterocyclic, quaternary amine or organic acid moieties and Y is selected from the group consisting of NO.sub.2, SO.sub.3 --,H, halide, alkyl or SiZ.sub.3 wherein Z is either alkyl or aryl.