... 20mA,RS485 4.support remote control water flow meter (LCD display),water level meterSBL digital target flow meter is improved ... chemical engineering, energy industry, food industry, environmental protection and water conservancy etc. High accuracy, anti-interfere, anti-impurity, ... external power supply of 24VDC; 220VAC (only for separate digital tube)Output formsSite display reading; 4~20mA (2-wire ...