A scaled down version of the traditional digestion test, greatly reducing the hazards associated with contact between the technician and the reagents. Ready-to-use cuvette tests containing predispensed volumes of COD testing reagents are cost-efficient and environmentally benign. Developed to conform to the requirements of ISO15705. The cuvettes are borosilicate glass with plastic screw caps, resisting up to 6kPa (bar) pressure. Require a block heater and photometer to complete the test.