20 piece water level switch liquid level sensor 24vdc level controling sensor for pipe or plain surface of bathtub or aquarium

the instrument does not need to be installed with a hole in the tank wall to install the sensor. the meter does not touch the liquid medium in the container or the gaseous medium in the container. it effectively solves the world technical problem of measuring liquid level under special harsh and harsh conditions such as strong corrosion, high toxicity, high pressure, flammable explosion, high purity and no bacteria infection.