ELS-1100 Universal Series Photoelectric Level Switch, to meet the needs of most applications Brand: Gems / Zimmer Model: ELS-1100 Type: Optical Level Switch Output Current: 40 (mA) Measuring accuracy: ± 1mm ??Operating temperature: -17.8 ~ 80 (℃) Material: Polysulfone or Nylon Supply Voltage: 5VDC/10-28VDC these polysulfone material Optical Level Switch both compact and inexpensive. They have a variety of installation, power supply and electrical connection options, allowing users to easily meet their application requirements to find the type.