WS201-868M - Smart Fill Level Monitoring SensorWS201 is a wireless fill level monitoring sensor that securely monitors a small containers fill level, especially tissue boxes. Equip with the ToF technology with a high focusing detecting range, WS201 is best suited for close range sensing applications with great accuracy. Its ultra low power consumption and standby mode ensure a durable battery life. With a special structure design and damp proof coating, WS201 can work stably in the metal