It depends. First, let me say that Cobalt ML3 is ideal complement to Cobalt L3. They were developed to offer a complete and integrated solution using the same technology and same software applications.
Emerald was mainly developed for mobile monitoring, but it is so easy to use and flexible that many of our customers also use it for fixed monitoring. You can find Emerald modules being used in restaurants to automatically monitor their refrigerators, or in supermarkets, where they are used in refrigerated storeage and display cases. Whatever the situation, our field engineers are always there to help optimize site installations, and to work with customers to choose the right solution or solutions. That goes for your entire project.