... all kinds of medium ISO9001 Ultrasonic water level meter for level measurement Ultrasonic water level meter working principle: the probe launch ... Provide MODBUS7. Relay output:Floor\Highest alarm and control (material level/liquid level)8. Temperature range: -40°C~ +75°C9. ... 1MP12.Electronic unit shell material:Die casting aluminum,Plastic-sprayed surface13.Stroke : Liquid level:4m,6m,8m,12m,15m,20m, ...