What is units in operation?

As an AI language model, I do not have access to real-time information about units in operation. However, units in operation typically refer to machinery or equipment that are currently in use for specific tasks or functions. These units could be anything from vehicles and construction equipment to industrial machinery and medical devices. Maintaining units in operation is critical for the effective functioning of businesses and organizations that rely on them, as they enable the production and delivery of goods and services. Proper maintenance and upkeep of these units are essential to ensuring their longevity, reducing downtime and increasing productivity.