For small flow rates of gas and water, instantaneous flow rate indication and integrated flow rate display can be performed. The flow rate is output as a 2-wire DC4 to 20mA signal. The straight pipe part is incorporated and it is stable. The transmitter has a compact body of about 600g, and is compact and lightweight. Easy-to-read LCD display with backlight Tube fitting connection possible AIR flow rate: 1 NL / min to 500 NL / min series.