The principle of MODA-4 is in accordance with ISO standard 14855-2, and it is suitable for any researchers who want to investigate the biodegradation easily before moving on to full-scale testing procedure in accordance with the ISO standard. For example, you will be able to investigate the progress of biodegradation with a referent material (cellulose), a blank and two other testing samples. Also you will be able to investigate the different situation in the biodegradation with one testing sample under the four different temperature conditions. Such usage of MODA-4 is the special feature caused by an independent temperature control system for each unit.