The System-10 Btu Meter is a highly accurate microprocessor-based instrument designed to provide energy, flow, and temperature data. It is custom calibrated and matched to an accuracy better than Â±0.15Â°F from 32Â° to 200Â°F. There is complete system-wide calibration for the entire Btu measurement system for each specific application with certification of calibration. An optional communications card provides complete energy, flow, and temperature data through a single network connection. It is available with LonWorksÂ®, Johnson Controls N2, Siemens P1, and BACnetÂ® interface cards.