... all kinds of medium 4CE.UL.RoHS Universal ultrasonic level meter for distance measurement Ultrasonic levelmeter working principle: ... Sensor material:ABS /PVC6. Output signal: 4~20mA 2-wire,Provide MODBUS7. Relay output:Floor\Highest alarm and control (material level/liquid level ... .Stroke : Liquid level:4m,6m,8m,12m,15m,20m,30m Material level:3m,5m,7m,10m,15m Universal Ultrasonic level meter\sensor