The FDX-SL is a scanning pyrometer. The unit can measure up to 30 inputs, based on thermocouple types J, K, T, or E. The FDX-SL has an accuracy of ±3°F (±2°C). The FDX-SL has a RS232 Output. Each channel has high and low alarm capabilities. The FDX-SL is powered by 9–48 VDC or 12-30 VAC. When in the Manual mode, use the Up and Down buttons to select the channel you would like to view. When in the Automatic mode, the FDX-SL will scroll between the enabled channels. The FDX-II is designed to fit the footprint of the Model FDX, FA, or FAX for easy replacement.