1. XKC-Y20 contact liquid level sensor, glass, plastic, ceramic, tile, brick, ceramic tile, cement, wood board and other non-metal containers and metal containers such as copper, iron, stainless steel and aluminum alloy are evenly detected. 2. The detection liquid level is accurate and stable, and the cold, hot and boiling liquid can be detected. 3. Pure electronic circuit structure, non-mechanical working mode, stable performance, long continuous service life. 4. High stability, high sensitivity, strong anti-interference ability, not by external electromagnetic interference, for power frequency interference and common mode interference has done special treatment, to Compatible with all 5-12V power adapters on the market. Specifications:A:XKC-Y20-NPN NPN signal analysis: if there is induction, the output is low level (negative pole), if there is no induction, it is disconnected Color:White Material:ABS Package Contents: 1 * Liquid level sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.