The Sigma LT hand-held, remote load-bank controller networks as many as 25 load banks using CAN bus communications protocol. Operators can monitor and control all networked load banks or a single unit in the network to 800 ft. The controller can vary, accept, or reject load on a single unit within the network. Single-unit control allows data centers to simulate hot zones to determine how an HVAC system reacts to temperature changes at specific server-rack locations. A 4.3-in. color touchscreen on the controller displays three-phase voltage, power, current, and frequency readings, and selected load. Data logging and statistical data can be downloaded to a USB flash.