16-bit keyboard operation. Cumulative flow range. Instantaneous flow range. Flow accuracy. Standard 2M, optional high-precision small blind zone type or larger range type. Probe dead zone. Transducer (standard), 4~20mA, 0~20mA, 1~5V, 0~5V, RS485, 1 channel (default) or 2 channels 4~20mA, RS485/232 (support MODBUS. ).