Features: Can connect to flow sensors, temperature sensor,solenoid-valve. Monitor real-time flow rate and total flow number, and control quantitative flow. It-is suitable for chemical-pharmaceutical, food, small and medium-sized pure-water machines, quantitative (batch) management control of gas-and liquid- flows in industry. Working voltage of solenoid-valve DC12V/0.3A-0.5A (normally closed solenoid-valve). The quantitative range-is 0.1-9999 L/gallon, and the K value can be put into the instrument. Specifications: Material:Plastic Size:Approx.10.3x7.8x3cm/4.05x3.07x1.18inch Operating voltage range DC24V 8V/1A. Constant Maximum-. 1-9999 l/min. Flow probe voltage DC5V (flow probe input pulse signal). Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Water Flow Sensor