A-7320 is CHEMetrics Single Analyte Meter (SAM) for low range COD analysis. It is compatible with CHEMetrics 0-150 ppm LR COD vials (*Kit Cat. Nos. K-7350S, K-7355, K-7351S, K-7356). The unit is powered by 4 AAA batteries (included) and is safely shipped in a cardboard box.