F3R Clip-on Ultrasonic Flowmeter With LoRa Communication For Reverse Osmosis Technology LoRa Ultrasonic Flowmeter F3R, Helping Reverse Osmosis Technology ◆ Reverse Osmosis◆ Pipe size range: DN20-DN80◆ Output: RS485, LoRaWAN communication◆ Screen display in 4 direction rotation◆ LCD color display screen