NON CONTACT: This water level indicator is suitable for the outer wall of non-metallic pipe without direct contact with liquid, and will not be corroded by corrosive liquid such as strong acid and alkali, and is not affected by scale or other debris. MULTI-Point Detect: The liquid level sensor (probe) is installed above and below the outer wall of the container to be tested (the high and low positions of the liquid level) can realize multi-point series connection. Widly Usage: penetrating various non-metallic container pipes, such as plastic, glass, ceramics, etc., induction pipe diameter 2-10mm; suitable for all kinds of plastic pipes, rubber pipes, nylon pipes, glass pipe pipes Level detection. High stability, high sensitivity, strong interference capability.