Abstract: The multiple chemical analyzer incorporates an improved multiple diluter, multiple pipettor, multiple colorimeter with probes and a signal storage device into a machine whereby a number of samples are tested and a signal of the colorimetric value of each sample is obtained simultaneously. Agitation, time and temperature can be selected. The record on film or in electronic storage units can be supplied to a computer or interpreted individually by a voltage measurement of the stored signal or if recorded on photosensitive material like film, the densities are measured or visually compared with standards. With the multiple chemical analyzer the operator can perform a single analysis on many test samples or a number of analysis on one or more test samples simultaneously. Multiple dilutors and a portable probe colorimeter like a photographic light meter and a variety of colorimeter probes are described.